Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0fc16b0ed1aa4a8…

MALICIOUS

PDF

85.8 KB Created: 2021-06-30 09:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 58a99c3759095ea26d96232ab00b359b SHA-1: 71b6aec9d879a85d0b398e6028affa7192af8d95 SHA-256: e0fc16b0ed1aa4a8116676594ab4691d6b5d9510ce6e9a5fac902ceed806c2d7
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution vehicle. It contains a large number of external links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or downloads. The document body is heavily obfuscated and unreadable, providing no direct user-facing text but reinforcing the malicious nature through its structure and embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=different+types+of+black+forest+cake PDF link annotation
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/mt0tff80p6m7t90vcf31u1oi3q/16356546762.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/cbabdfc0b83def142b6a7f2e11f993b3/90116000251.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/3db3a67d119bb91eee2fb045a210add9/76427471202.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/sotetekigabaselixenilenow.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/2684112604.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/78667497815.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2689529272---jafadurilopubetij.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/63916139988.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e8bbe1a69c18deef917ae9c3b5e6fb81/87959250703.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/jipezaponoje.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/d069jfgoofjscr8makuef9cbu4/1494997244.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096373a071e8---wirisutezexop.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abef1374c11---79015301937.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/41158646857.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/tewujo.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/wevolixe.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/gegotufuzidawilusi.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/94992736455.pdfIn PDF document text
    • http://lukinserv.hu/file/regumibi.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f933c919d25b267eefabbeb647bcce27/sotororafete.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1bad2eb10---78374209174.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/12405791721.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/sarikekemurufet.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ebd53167dbd7dad939ff7e926e66b03b/duzagakilarunemi.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/mubojenonakore.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_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 10820 bytes
SHA-256: c23a3908d4fc212239c76edea907e45c8fbb506e43e2e036aeb72aa121446084
font_01_sfnt_off000101f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F9 17764 bytes
SHA-256: 4ac6607d3a21be08b215d0c2be65451a8370cb942ac1d58fa72b4a8e02201f77
font_02_sfnt_off0001305a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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