Malicious PDF — malware analysis report

Static analysis result for SHA-256 0225fc667142621c…

MALICIOUS

PDF

99.2 KB Created: 2021-07-09 03:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cbf67894fc5029b7ff484509a0f3bba0 SHA-1: 0a34a22d64259753918fa34a6df761caf93b69f6 SHA-256: 0225fc667142621ca22bfb9296c95cb78c048490dfaa8f85eb8f2ee059f7447a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites hosting other PDFs. This suggests a multi-stage attack, likely for phishing or malware delivery, where the initial PDF serves as a lure to further compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/eotrf5198ijfduocc2b7vgdl6u/29888310112.pdf In PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5e401a86128593030ac38d4b5a44bb6d/lirofexobetokodezid.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/29722547508.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4153d5403---97837970353.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/besifudoxuz.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/a4b38f201d4d2052d437aa01b370af5e/97364790828.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/39bdks4reaatq5dqete324chut/83874188537.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075193e0d31f---63888115455.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/zosenadejubuseruzaxiweze.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/89258105619.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/2d94104471018c4c2e59c537d42ef25e/51853457395.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/10479598367.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/0f77ddc3b09986573d92ac6ab43bb30e/zewelenozej.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/71283671390.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/fb29biamdjajm0rh4pbmn3o9na/73391667619.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/ponidozajatole.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160712e4c4ef3e---44489425226.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f18323db1c---2262557957.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bf2c01afa---38726015109.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ab266cac5---xajonurexuvomixin.pdfIn PDF document text
    • https://tonitomov.com/picture/file/wakije.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/89485730822.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/jokomodowudisaxepaw.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/0a24a4fd9b10a595821faf22928595a3/22118714537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=neuroanatomy+questions+and+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000ff22.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFF22 20104 bytes
SHA-256: 4aa5352192c03dfc3c7f752e0dba04cfef5b7944fb55c858032fde37ee324d82
font_01_sfnt_off00012119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12119 17736 bytes
SHA-256: dc8217a3ccdba7ac3600956d4509b627661d100fddfb2d031b056e78971a51f1
font_02_sfnt_off00014dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000165df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165DF 10784 bytes
SHA-256: 6de11f162e4b84e19ef291ba78c3fdbd7d301d86be3ed9b99196c2f1d9187c5a

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