Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2d8480f914f93b…

MALICIOUS

PDF

79.3 KB Created: 2021-09-01 03:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d842f1323303988e4f8779b6c9f8d4f SHA-1: 79b06788e6ae4c95f7ba72705ed40d0ab823d8e8 SHA-256: 0a2d8480f914f93bda971c68dccf60ec29745159291896700bfe56303f2f8c8e
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs pointing to compromised WordPress sites, indicating it functions as a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=how+to+play+wii+golf PDF link annotation
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/6e68e2k1bbbb8p3e63lcrr25uh/divudivu.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608995cb1d60e---mijirixukobumafajizisema.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/120201485.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/fikusutegu.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160881d2e641e0---jizexedotafenelekuf.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/dukulafodiduw.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/nelexetavowubasedazaj.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/75026842342.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/87232752672.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/42787813656.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/bibenanikuk.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/difatedobakisoguxasipuf.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6b76833a50fb6aa438a880809181e38c/perufejivekelejamuxi.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/xinixep.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608763a6ec502---98195406006.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/wezuvemewopo.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/tobifalisexurivewidi.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad7ff67a82---konaseripuzepogawew.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd6ecaac3f---jaworoziwoxed.pdfIn PDF document text
    • http://sequoia59.com/clients/867919/File/39260223808.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021514615195876.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43e1a36244---65319821908.pdfIn PDF document text
    • https://edgecs.com/documents/madakomekasafugap.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898614efc20---bufujobose.pdfIn PDF document text
    • https://menu2uplus.com/images/file/96624293175.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_off0000d4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD2 17000 bytes
SHA-256: 3f8272c8b852e93234d254d780cc6007883d9e4ed65aab1bae990b50635eee62
font_02_sfnt_off00011889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11889 10220 bytes
SHA-256: c4387aad1748e57ebbdbafdfd8fcb880d5ef862f95c6e50927ba0013f2d026e0

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