Malicious PDF — malware analysis report

Static analysis result for SHA-256 088f10989f8d687c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 03:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7ef82f773312c9bcb3b2dbe767867727 SHA-1: 77ecfff62bbebdd346c6d2370c4bad6ee32481d6 SHA-256: 088f10989f8d687ceed635497741e6ce381553ec5f2086d5a11d0f5bbc706de7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be disposable or compromised, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://krisoc.ru/uplcv?utm_term=dragon+ball+z+sparking+meteor PDF link annotation
    • http://bdsps.org/slbdavbatala/userfiles/file/sadanonifepalobuj.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/21373897616.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/piduxidamerakuxusuvar.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/30891434527.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161374452a1ee4---34401178111.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109151649284439.pdfIn PDF document text
    • http://esistore.com/userfiles/file/givokad.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9a5135aefd9374952e83bfe933850cb5/lajijiwup.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/43334547986.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/87180367554.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/36027240562.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/bogufatenazudalobewitapo.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cmaod73j09hs0c533j0fppmfp7/90686726514.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/76319699539.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/1133985243.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/widilekitufog.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/52750784040.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/71944268971.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/55749297122.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/33529319249.pdfIn PDF document text
    • https://sapporopools.com/contents/files/vuduzanonemajene.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/1898143052.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/74285644437.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_off0000d7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D5 20216 bytes
SHA-256: e101f55856daf28db4d0772e8bd7cfac29ab011a1fc5c94ae5444612633b03d7
font_01_sfnt_off00010c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7F 10888 bytes
SHA-256: 8c7fe910b4ddb1c8c2cde461c0ffdd7622129380f663754f5bb8e3ae938bc1c1
font_02_sfnt_off0001257c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1