Malicious PDF — malware analysis report

Static analysis result for SHA-256 a637db18c76ab2e9…

MALICIOUS

PDF

86.2 KB Created: 2021-09-09 14:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9000a65d67eac36c0b292a1d13c3d11 SHA-1: c1cf71f204625bdc51a4f71c7d17de1a6d73d707 SHA-256: a637db18c76ab2e991436bed35028594f9b6eeaf7bd94cab6ca26e06d6e0aaa9
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits multiple high-severity heuristics indicating malicious intent, including linking to algorithmically-generated URLs and compromised CMS upload storage. The presence of a 'download button' lure further supports a phishing or social engineering attack. While no scripts were directly extracted, the overall structure and URL patterns suggest the document is designed to trick users into downloading further malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://pixomot.ru/uplcv?utm_term=magisk+android+tv+box PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac6d58fbe---wetalozajepebol.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613246186066f---mekopafomuveg.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/87530878734.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/jufabamuvuk.pdfIn PDF document text
    • https://penzion-palice.cz/content/bemavulevisexegop.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c81ccea54---lezitafi.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/lapixekulelijuvaworakub.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/zokategiviwivivizifoj.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/jamorekupapobaradufojit.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/busebuxopos.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/naluzivexexepawisip.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/34211527710.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/gufozugaxuwerolebezox.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/58840688983.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/fowabupaleroxopeb.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210909150824.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec3363b06e---jaxidupibajuwerukot.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/82628832298.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/29439057861.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/sepusegefobabupomegebe.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/xagitinetu.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/2079203667.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/15246536527.pdfIn PDF document text
    • 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_off0000e6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FC 19976 bytes
SHA-256: a909e7a9e82c6e98bca1b2b027e8bed870907ac3212cc37611b6365ce58475f0
font_01_sfnt_off00011b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B10 10640 bytes
SHA-256: 16f2046a3c679aa7ea8eea0ea70a5b5d787f9a9fb1aa5f0cfad7fb29395bc8f8
font_02_sfnt_off0001335f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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