Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7054c2a23e70319…

MALICIOUS

PDF

69.3 KB Created: 2021-10-03 20:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a6f49270521ad199dcdafe0f14a2648 SHA-1: 8352f7853271920934a8c861351014cc753dfc1b SHA-256: d7054c2a23e70319c659fc1803837efe3b4dc03a4e2ba9ab53b6b08c66b03eb7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution tool. No scripts were extracted, and the document body was unreadable binary data, but the heuristic firings clearly indicate the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=james+hutton+theory+of+gradualism PDF link annotation
    • http://airconbank.com/upload/fckeditor/file/29793609079.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/ralinojuburugujalux.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2126adca5---73961688075.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131339328009---febikadukifomakuvot.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/xugujubepekuxebo.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/zadopoziwikekibasigife.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/wedexelujibumoko.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/rozilurizusetede.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/a69c3560869834bce571bd4915582e14/zerewig.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/ribububonibuxarezuvowa.pdfIn PDF document text
    • http://df-foundry.net/d/files/pasiveziranakoxiresevomu.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/57973060965.pdfIn PDF document text
    • http://dip.natura2000.pl/imgturysta/files/94498620006.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c50592e985---75389496646.pdfIn PDF document text
    • http://parateam.cz/file/joxovosigez.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/985458589.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/tanutubonujapavug.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/figejajij.pdfIn PDF document text
    • http://biosite.ru/images/news/file/fegizumug.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/31283117011.pdfIn PDF document text
    • https://mollis.rs/files/kiruj.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/29910261436.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210908140716.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/30402913498.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_off0000af57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76E 11004 bytes
SHA-256: a0c3117cd73450a4b7aa5bb89de37519dc7dc0c7af017cf8c225fc6f603dbc5a
font_02_sfnt_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 15500 bytes
SHA-256: ca7def1789976180d302d324bb4e089aa4a15603a0c4608f5dd2a7e78af7d8a8