Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e946e718d9cebe8…

MALICIOUS

PDF

71.8 KB Created: 2021-10-03 15:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c54fd5a547dd12178ab71347768331ab SHA-1: 878dd7870472e235aae5c65cb594d833add445ab SHA-256: 4e946e718d9cebe82f56e84b21b57c2662b3128dc43d7548da4783727e86ffe1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed for phishing or malware distribution. The embedded JavaScript stream, flagged by heuristics, likely facilitates the redirection or execution of malicious content. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=supply+of+money+graph PDF link annotation
    • http://kkagro.com/media/images/upload/file/kixutuforimuditun.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/bukafonozafanaxawis.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/46250023653.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/ritavarofuxewosopizowogew.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/78061535321.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/0dfbc945edbbfab7fb858c43604f2ff7/80042219514.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/vanesuzonidovase.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/nuxufulu.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/fudojetux.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/sawubapuperoledisegefi.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/gupemanejezem.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/buzuzinadisetafibisi.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/47984627566.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e774a3d8d9ea3254a91f087cd9429c89/jadoposegoxolovuxapukipa.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/nokuxot.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/26763381684.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/23lkbsl2lbd3heugs1nl2f38d2/42032240493.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/10287723330.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/69238430298.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/56324542150.pdfIn PDF document text
    • http://toroisg.com/public/images/files/rojisabiwizunaw.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/bikukefojumin.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/xanafupafiposeweli.pdfIn PDF document text
    • http://getdol.com/page_data/file/64767232664.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/63870391848.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161589f1b4d4a9---86073516303.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_off0000b4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D0 10736 bytes
SHA-256: 06487f392106a9e1eed64a062d959a2cfa593985cfc620a13dd89eec9054142e
font_01_sfnt_off0000cd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD50 17220 bytes
SHA-256: 2833ee1cf79f6bac7431625ee3f43633764efc7ea48e858d6ca78cfd15c78bb9
font_02_sfnt_off0000f9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1