Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ab8641052c777f…

MALICIOUS

PDF

85.8 KB Created: 2021-09-04 14:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: afe51ae205b4a58a57ca63064079b537 SHA-1: 32aa2b43d9729eb35b9acc50818f1cc3084c2e11 SHA-256: 71ab8641052c777ffad710cbe8bcc89999c51f09bd97d71cf872aec64eb33d81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, suggesting a phishing or link-farming campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary goal is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://crewmak.ru/uplcv?utm_term=jurisdiction+issues+in+e-commerce+pdf PDF link annotation
    • http://dichvutot99.com/webroot/img/files/87834691207.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ccb14d9ee---36860369597.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/9f8f5cd8c7b45f4821c6f36ca34283c5/dusetelinalamidome.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089acc3506d1---nipowazi.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/c9956e5ad30087fa0291c34b8ec74474/84048847280.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/puvaruluzusofefixerovod.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/268ef2faa07c00563d4875ea7444c8e4/49891799857.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/48140570512.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/56801392413.pdfIn PDF document text
    • https://menu2uplus.com/images/file/motunupoxivepefelodalow.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/konovutorif.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/79190969555.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/52680087832.pdfIn PDF document text
    • https://davaocarrental.com/images/file/13776305816.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8587dc9a34---77638989109.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3bfa0294b5b68f0d9721c763dc0b1075/xapasurapegef.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/68442135745.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/50085198412.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/98835145510.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/86560747716.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/80680951134.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/57884267672.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954d1fb5255---gubotivewironukawoponekab.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db249259d24---72710244896.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/fejur.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_off0000e9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F9 18132 bytes
SHA-256: bde2971aa7bc617960a81c46dc59e871b3c5c70bbd238e02de218483aeac3a5b
font_01_sfnt_off000118f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F5 10696 bytes
SHA-256: 34e30c2da5d286c1a79f57fd9ab3f4211f076a350df4e485dcd49873a288c520
font_02_sfnt_off0001318a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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