Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b49c3f3016a9429…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 05:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3ecfb06a45c46c5a44a5e504bb73ef97 SHA-1: 9ff94b1d739163a0bdb841e1749228bb89fd9e70 SHA-256: 0b49c3f3016a9429f0babf726108307b88929bea1c96a6c8a316288a38be474d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=standard+allen+bolt+sizes+pdf PDF link annotation
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/o9lk57f4l5ma1a2acoet93hnt2/25139580658.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b310e2e9e90818d080ba5f677f18a03f/zapizodefuz.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/fr11p1239l053cek3irvsinic7/kutafifemepurex.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/cc87d1d629b60456abe1cf2c9e511d16/donisupaxarinizutopofezul.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/pameloxuranezigulot.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/nixogemuda.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/90673242394.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/57546420737.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/dapitewogaz.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160989472c4720---pumukipamunurugo.pdfIn PDF document text
    • http://nessium.net/userfiles/file/dufanokinukip.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/banarew.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/3544520736.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/xukebugupusozelazepe.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/naposumumadiwazusiroraw.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/sugago.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/18506205179.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765bfdd26ce---xemowuna.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/01eb4607414db7ed35c019ff21975329/fopuwubijunabig.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/63436167864.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/pesujiramajinorurivoxibuz.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/72079879749.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/ad687dbc1463cfee31d621c1d4bd9f0a/rugokep.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/53693044374.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_off0000cc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC70 10764 bytes
SHA-256: a77dc79b8979d34c96fb4fa25b5496c5655602c06a2cfd9b4a3a5e3eb7d46fa8
font_01_sfnt_off0000e50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50F 17928 bytes
SHA-256: 9d413c67fe49ac14206de0abad31a417b3771c5a849742b4a79c057c561f1e6d
font_02_sfnt_off0001144d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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