Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace94be1a45bf707…

MALICIOUS

PDF

73.7 KB Created: 2021-09-01 04:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 08edf8f43f28243edad6215ed9fb9090 SHA-1: 936a3719c30db0cfb905f29e016ebb3b95d162bb SHA-256: ace94be1a45bf707b05dfe02969c84fa62ca264207eba16fe5bc326e1f79831c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, characteristic of a link farm designed to lure users to malicious content. The presence of multiple distinct hosts and UTM parameters further supports the link farm and SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hm7sju067h12ll7f6le3ajrlu2/25438841617.pdf In PDF document text
    • https://corpusbg.com/files/fck/file/96687144236.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/29761690234.pdfIn PDF document text
    • http://xycrusher.com/d/files/90408471850.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/5104048446.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/95934847688.pdfIn PDF document text
    • http://kyea.org/imageuploads/lulavodanirudibok.pdfIn PDF document text
    • http://one9five.com/userfiles/files/rerunewiritug.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/49564216494.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/24136485666.pdfIn PDF document text
    • https://ikima.fr/uploads/file/togurunamowilikudoja.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943a9f797cc---17549242235.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/728fb572d1aa2e61dc7c1a4f5531c400/24346117618.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210825195648_865687178.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/soxuzopinewoxoxetajota.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/10687716461.pdfIn PDF document text
    • http://htwy.com/upload/file/lipaloleke.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee71d4de490---11357060316.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/67376560a16cbb12565207487d78b5c0/xurelimisemexeduxegalil.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/2on1mo05k91bmfkhbnd9tprq4d/nijafatamiberumifunipoguf.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/71255335385.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16098856a1a99a---24515424855.pdfIn PDF document text
    • http://primaneighbors.com/userimages/25350596092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=names+of+god+and+their+meanings+in+the+bible+pdfPDF link annotation
    • 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_off0000c0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F6 14904 bytes
SHA-256: 5d73b72a74d02d9bb36bbaa8d282dd45373f133a2349bd4dd51bea2dca1257aa
font_01_sfnt_off0000e672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 11060 bytes
SHA-256: 0fb8c692eea23e11891f743f204be9d01f42ee07bcbe8fc999e78b73834f3be7

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