Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d140e2c5f8e21ab…

MALICIOUS

PDF

81.9 KB Created: 2021-08-20 15:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c2bdeca46d9da2612cb547f641712cfa SHA-1: 42c49e4de4302ca38815420591fac49c27519bb9 SHA-256: 8d140e2c5f8e21ab90e4e17a710e50d0ea5aa76182d257989760fd7f65a7329a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://laborke.ru/uplcv?utm_term=how+to+set+aside+a+prenuptial+agreement+in+florida PDF link annotation
    • http://teifsepahan.com/files/file/muzurogotozo.pdfIn PDF document text
    • http://w-mill.jp/images/file/91096504524.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/145e85d8d0cc2ff166b2edb1f6fe6666/20826644860.pdfIn PDF document text
    • http://charontrade.hu/data/file/bisepujibomirerakotav.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4e3fc494d560689f17ec06ec660a0841/13600285982.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/a187e2bf977c7555b022def32bcb6254/vibujamidagiwuligunurilu.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/zekanasov.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/14451256030.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/54681954398.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/merixudozuwevo.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16088bc3212339---21276645953.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/tosegoguzimowitovonu.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/zojejavamujakom.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084df083dcc1---694694487.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/55049068076.pdfIn PDF document text
    • http://speckrepej.com/upload/file/xatowujuwilumakuk.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/67b05c8e9fed58651986c66a8a59bb7f/nadigovapixuvigemejo.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/2044590557.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210625073519493.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ccfe7a7c---rukabilebejisedovaloje.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094acf32d333---54472800984.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/e1dt9rkiijp5uq66uokffo27jt/30621573681.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/90677883140.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_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 11016 bytes
SHA-256: 634b2e98622cf65edfc50483190314345162b532bfd0c91e0a3342e39beacd66
font_01_sfnt_off0000f6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 16284 bytes
SHA-256: fb980c07a69c6eb8f038c612ae1249460b410b125a4f87698f3c5160d6590520
font_02_sfnt_off000120cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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