Malicious PDF — malware analysis report

Static analysis result for SHA-256 7929a1bcc10b3821…

MALICIOUS

PDF

83.7 KB Created: 2021-07-14 02:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0158b9e23db743432fcaae26cf997b7c SHA-1: 71a14f6f8a6753b640aab88b906c5aee4c47cea2 SHA-256: 7929a1bcc10b3821ca53b7b00115d580ecd3d2aacddef87386d8c0314c98d46b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The presence of multiple external URIs and link farm heuristics suggests the document's primary purpose is to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 5

  • 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://huntic.ru/uplcv?utm_term=memory+card+recovery+apk PDF link annotation
    • http://asja-doll.ru/userfiles/file/40320939118.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/562e312978888f7c42dc277169ff1ed3/fotoxinopilekoxapi.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210517020630.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/a9d691a035532a677c904b79927037bb/kubine.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/fe8d3645f58ba4fee0c86dda45826b9d/33537238791.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/1954676213.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec75e1d4ce---sipusuduzolowetefukivedo.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/34803207374.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/37154192588.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/guos7qbcdi35bs9iqvvrtqtkd6/28542933377.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/vamukadej.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/06524c0a6cd3f2dce1585215c70b207e/43639109766.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/12185762373.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc47954a52f---11164650864.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/pezuwagusizu.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/93474095537.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/87006605002.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/36870603008.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/91024780059.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6951173bf5---61151581399.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v4124pl85l9d83e81vf901rqn3/birigugepuxig.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/sigigokabo.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/kaoe1th75fnik4f8vteqld6g6p/veram.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/2031107404.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6A 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off0000e2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E5 17620 bytes
SHA-256: cfe3959d8c45b54f40008e781c644ee5a8ef60c4ec5e978d1c2548c16aad3484
font_02_sfnt_off0001101c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12833 10432 bytes
SHA-256: 9b8e601c4779888f1dfd746c966731657714fdc62438538fe2afa3bffaba0457

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