Malicious PDF — malware analysis report

Static analysis result for SHA-256 9944ed1e5e2dd339…

MALICIOUS

PDF

77.5 KB Created: 2021-09-10 14:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 443b5d6d3f09b3c8fdeb53884e9f358b SHA-1: 02e6655d270edcf557a26a9b2189f8cd09f61102 SHA-256: 9944ed1e5e2dd3393f142c1b10e9555c787942765744718369256793d29715f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://wastran.ru/uplcv?utm_term=come+aggiornare+un+android PDF link annotation
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/bc3efa0114b65b7da7e9e2a15f4ec4f6/45398575275.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/pulosu.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/xonedikumuxoxulo.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/domifejasased.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/31558994496.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/korid.pdfIn PDF document text
    • http://mobiliteit.nu/files/livazodawuwefoxexegonefir.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/wuvuladenikufewedulewipop.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/bogolosimubonufivot.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/75186446561355001859c6.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/19369713312.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/37248398441.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613687a4cf6b0---26310188796.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/86430239331.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613a13b07244e---47943601056.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/48704085153.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/35926598912.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/siwewojolikoxojozudo.pdfIn PDF document text
    • http://roocenter.ru/upload/file/falisegemedu.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210905110506.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/zakomituwetipajaka.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/37835437709.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_off0000cd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9D 16908 bytes
SHA-256: 4e871b0b1c069e6d38674f70da59122e239562349a2e72cdd119fa7feecd4fbb
font_01_sfnt_off0000f94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 10408 bytes
SHA-256: cc3810be664ca2017492fa66e3d0463c53c56140ecf12f35dd66df0f630bb902
font_02_sfnt_off0001109a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1