Malicious PDF — malware analysis report

Static analysis result for SHA-256 af68b0a20d5070fb…

MALICIOUS

PDF

77.0 KB Created: 2021-09-06 05:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16cc1145987027ff58cb8bb6444989f6 SHA-1: 22b23cab4fe89c3532b6773b0df5ffcad308ce25 SHA-256: af68b0a20d5070fb1d4ea0cdeca84b0e70a12ac8ce9e50eda5dd50b2ac1dc409
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various URLs, some hosted on what appear to be compromised WordPress sites. The presence of multiple external URIs and link farm indicators suggests a phishing or malware distribution attempt, likely using a spearphishing attachment as the initial access vector. No scripts were extracted from this sample, limiting the analysis of its specific execution behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://infrive.ru/uplcv?utm_term=atom+infusion+pump+p600+pdf PDF link annotation
    • https://fsbulletsandbrass.com/userfiles/files/56573266743.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/nizebujotelodejexuvo.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083953c6b6b3---panegadine.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985fef8853b---pofodusason.pdfIn PDF document text
    • http://djapm.com/userfiles/file/vesazusaxakap.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d738d76fd4281543457300c2bad39b7c/defodiresofa.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/tafoxukotigaxobekolela.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610511ca349fd---57360517097.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4476b4f97---76070136273.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ab5139038---sigirorukalaxujupuniwuda.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/f940e2eeef41d3b6f69d9018e18c56b4/95914397373.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021082001244073499.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/bh6hb3p34os5hr6n7m1qn0tqi3/poraninekawop.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/27930069810.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/42273457713.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/gejozisefadimu.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/271606544531.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/demuvulipaselojodu.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/3835836563.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/safepisinujixitibumonesan.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/pvrv9oogp02d99fb8e4rpoj6b2/sovodadamoxemepina.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/dfae07f4dc3a8f43e2855d6664dc1c2f/sizolojineloto.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/fba703b9779fa130d0c1194b4776a725/kofemofigozujobanibebi.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/15a61a6f25a72abef596574bb8315e09/99462817120.pdfIn PDF document text
    • http://i-dron.cz/data/file/toxofovofutax.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_off0000c78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78D 10588 bytes
SHA-256: 48c56523af9b29a6ba17ecdb801f714f2d88a78436fd11da21debf66b783d272
font_01_sfnt_off0000dfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 17744 bytes
SHA-256: a7f2b2751c5ad89dae6e8743915a07fd998d742041d238bd55d732c93f8c360d

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