Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf064208cf8175d…

MALICIOUS

PDF

90.8 KB Created: 2021-09-05 02:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d62d2497bba37a1357f82cd126773b6d SHA-1: 5071dbaba0605e316d70d3cd6c367f2ff167a811 SHA-256: 3cf064208cf8175dfee7e1f5075162f7036de28a8cc3972300e03df633ca4690
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers strongly indicate this PDF is malicious, likely a phishing or malware distribution lure. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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 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://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/9b75cccf664a33ae7e2d0869b2774f9f/50386644541.pdf In PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88e1c397a6---xuleri.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/566d187da660ab62494eb8b9295a5694/nesiniruzaw.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087b7789bd02---22596701830.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/jidajade.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/13230f845656bbcf22598a48e2fac098/50089065840.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/reraxesewel.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bewisovofanezuvofovakiwi.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a467bd74228---63074268163.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/vebimumoturatowulofe.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/37759645732.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/zuwusizovivezelapineza.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/0181812d2a726fe5ef16f285fc8e20a2/zuvejuzewuwenabilaz.pdfIn PDF document text
    • https://orangerun.re/photo/files/xubuwogajexujezaxu.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/34986267932.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/dfi2cu6dg1g2mr6c5hvmen2s72/38682737138.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/32910962768.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092da89e510f---93158557355.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/bebuji.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/67366401179.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/62720840504.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/64461572294.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/c07c98e7bfd6aca351cf6a7516c1eb16/gimatebamemowasuvovepele.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/22608111243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=denise+levertov+poems+pdfPDF 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_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 10564 bytes
SHA-256: fe6c7cbb39fa06f5701d2615c48fde38fcf17d5a953e5d9d955e14e098fb9949
font_01_sfnt_off000117f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F5 17700 bytes
SHA-256: 6040ec61c069c0dd3bcef173f0f245279470d312f4968a2f1d7395c1a600cde5
font_02_sfnt_off00014509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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