Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6de3300dd2a90e8…

MALICIOUS

PDF

94.1 KB Created: 2021-06-28 20:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3534854f25fb2cd09d01107c832ccf57 SHA-1: c6c60f11dd6edc3829e1361d607181f6a9e217be SHA-256: a6de3300dd2a90e878f64267896b971723b9fa4bac6254f4409fed8cb142b269
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to potentially harmful content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab11136c9c---wapodaxokokedubim.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/e1aca9a7c5c18f0cef4af127a1e61765/kipudaninanopakufezol.pdf
    • http://noithatdangcap.vn/app/webroot/uploads/files/gekiselo.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/fe4d1401749b9cdcdb2cf807c019fc7f/losezegesesulajimizopo.pdf
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/47763724054.pdf
    • http://easyreturn.store/userfiles/file/46386367822.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdf777e63c---95141076832.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160723b932f55f---72434245361.pdf
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/pegesodogofaruzono.pdf
    • https://meganimal.pt/site/upload/file/294973705.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vilikekaniw.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731eb8a7dca---93144321812.pdf
    • http://willbramephotography.com/31240885594.pdf
    • http://security-m.jp/tool/images/file/49041608259.pdf
    • http://vietthanhstone.com/images/news/file/24833127381.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebabd225f4---niwed.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/a32c8afd4bd4825240f55678eabd64c4/52344292769.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/3f3d45ac2b9008f4c237b7d6108feb63/vevadegukaludokidajofage.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ukiq3141snepu91ou9ir1r5ntb/sapux.pdf
    • https://prairieroseclothiers.com/FCKeditor/file/823387708.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/259jur2l8g6grv892ij8okuvrd/95537463937.pdf
    • http://kcobafl.org/ckfinder/userfiles/files/71625825614.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/5g34lmaqh1d0ua35e6t60k5ist/vakowiwubaniv.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/a87l7sgk77hd242dd6kqu04482/rakenotomupidezex.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f22fe1ddd50f38f8c1b9053e0a49e82f/jasetixazuxaborel.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+lady+most+likely+julia+quinn+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ebd.bin
62103bffdf6dcd868675c3b9f96bdefb0744aac4c05cfb44d0724e7a7a5d619b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBD 11208 bytes
font_01_sfnt_off0001288f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1288F 16792 bytes
font_02_sfnt_off000140a1.bin
c21bfaa1ea715d17dae133f3d7392288af4fd244a398955f977e5ee6d886d4e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x140A1 16488 bytes