Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7d3f32e88a1a50…

MALICIOUS

PDF

96.0 KB Created: 2021-07-23 23:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f84f395932ac94b9861fc67de6e860d1 SHA-1: e3ca99696776fa3fd66c2bdce109a07887b9769c SHA-256: 6c7d3f32e88a1a50c6ef6999b94ee0c61865ae95828ffce877af5dba85bf4abf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external URLs, many of which point to compromised WordPress sites hosting further PDF files. The primary purpose appears to be to redirect users to these compromised sites, likely to download additional malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of distributing malware through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • 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.
  • 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://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073a60ea0625---17333871153.pdf In PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a183147147---16144641003.pdfIn PDF document text
    • http://hnspkjx.com/d/files/jeduva.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/79414263621.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d3fa212d2---bubokenojivupakid.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/93212095977.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2b56961d2---3219553305.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/16535691611.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/331bb2f9f096fac78f349a34f28ef2db/59957736220.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/39934561526.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/59806820222.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/70235817539.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/92601930576.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ada94c0300885e0514c4be86f87c060b/xabexoroturogeg.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/b1f1625df48acc5a8d1c04f4a22a650e/15310384763.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/c687af0b2778be43ea77f84a7bccac9c/98758483411.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce34bf3e13---dorumakitofizezekedum.pdfIn PDF document text
    • http://bfo-walkforhope.com/clients/e/eb/ebd0efab9cd97e953e90891d9eec7aad/File/83572394693.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/wirogopirosatufitigavuros.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b64baaf9---gotibu.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f0ad95d83---89071433591.pdfIn PDF document text
    • http://amandamaitland.com/images/file/21406665715.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ce1b2acf0---65768201329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=turnigy+trackstar+120a+esc+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973
font_01_sfnt_off000108f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12107 21452 bytes
SHA-256: b6d236b247c618dce7276f36cf9a637aad79c53c99cb5b1e7f5649cb4e07006b
font_03_sfnt_off000157e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157E3 11016 bytes
SHA-256: c801003f21910a40964ed6b5eedcc8a155f0f9d46d99e82142017fe82ca5b17e

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