Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac1ed07430a0315…

MALICIOUS

PDF

86.7 KB Created: 2021-08-29 08:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 90b3bf1d37bd526ab3e79549f99376d7 SHA-1: 9a332f44b09f09ae480f55ff50695c0113f96331 SHA-256: 4ac1ed07430a0315ea1765135897ee734d7f24221068537340ed27320d755c39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm for phishing or malware distribution. The embedded URLs, such as 'https://inwebjor.ru/uplcv?utm_term=gynaecologist+near+me+nhs', are designed to mimic search results, likely to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://inwebjor.ru/uplcv?utm_term=gynaecologist+near+me+nhs PDF link annotation
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d83a0f753---52978589466.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/205588428860cfe55a3376f.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a5fa87984---duzirileg.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/79256969078.pdfIn PDF document text
    • http://tulga.ru/editor/files/muwimiwupipi.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/n4vtbvljncns6kgl822hdkaoej/49621472175.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/gidizepugotufareboxova.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfa1879b44---49471086226.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd04be065---17513516625.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/47030024348.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/35071842218.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2240ea09f---90082088787.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae026cdf901---jirisiwilawosefijujununi.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/latididofefasuvufilefale.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/34042819956.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/93255346080.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/88394199964.pdfIn PDF document text
    • https://polistirendecor.ro/app/webroot/files/userfiles/files/patabibadixinavazivijo.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/46825888847.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607548c1e5794---91695528310.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/dobizimeratoxevepiraku.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/9cc839u1vb4ban4dqcmb9j18m9/wipufujinife.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_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 10828 bytes
SHA-256: 671153b9c67fa23a421440f769cbfe1be26f933461a019e61d7f9f4189f70f21
font_01_sfnt_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3D 18028 bytes
SHA-256: 3501af61ef6cd746713241655a61c4d4d31d645eefef70b8e9006b8671995b35

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