Malicious PDF — malware analysis report

Static analysis result for SHA-256 5984107f2ef00085…

MALICIOUS

PDF

136.9 KB Created: 2021-07-03 10:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d2fd1eef9c1dcee9d1bec435f23d4a11 SHA-1: 926d292a8778c8e73d47baeb97851b55922f9d9b SHA-256: 5984107f2ef00085c2a7b55bbdbd491d0620f9df92c18c47dd31e75c3d68b78e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, suggesting an attempt to host malicious content. The presence of a 'download button' lure and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malware. Although no scripts were explicitly extracted, the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0b9754dd7---81527887943.pdf In PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/visujoraliverixuzima.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/6767c3e3ed194f0b0dc27c13b537b75a/13448694015.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3874ca3323---dugevafigi.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092893170542---xitedumipuduwuzimesivuwo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160901cc25fefe---ruwexipevuxowikikan.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4ea550ed---jobufinonekesonekotade.pdfIn PDF document text
    • http://ciskmv.com/css/file/kovuvevo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/60mkolf20dkpg93rapau0p7b40/5885152832.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/bbb2c0e0757af3309c0de4780ffb9237/58635454485.pdfIn PDF document text
    • http://meta-min.com/files/63414766575.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e718af9be---30061776358.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6c6bbbc97---girakaxokapu.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/8447458644.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc1f927db1---lopokogifubomalexu.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609abd4d5bb29---11048976294.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/fec24335180a60a5a89accbde520de34/tetidobaso.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ffa951a64272785ee0b60a7fc5da1e0c/subanejosubir.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e1a3ee8d---vomujelaledovemodawipub.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/1331084180.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160773967e6ba5---didedewisofazonokomagezi.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/345de15c13ab57c3bb76e2764877f8bb/77015609265.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c606e91b218---35633415954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=surgical+anatomy+of+anterior+abdominal+wallPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4B7 18364 bytes
SHA-256: 4f1e1db5797ba62f97b6f659e781d8cf9c2c73e8731c38f9214b3644b600646b
font_01_sfnt_off0001e3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3C8 11168 bytes
SHA-256: e71471af76cb1cc3a7e9c3d19626fbdc6b98cf5f34abe2a5c5e450b0f3567b9b
font_02_sfnt_off0001fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FDC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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