Malicious PDF — malware analysis report

Static analysis result for SHA-256 3021fc86d9bef5f0…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 19:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f266efcec0ea5cac9e9823c2ceed908 SHA-1: 02cea5034a06023b35c8fbb26d3ccf18d283c39d SHA-256: 3021fc86d9bef5f0efe25bed977cd5297e3bbb5d03b2984f396869a62728a95b
156 Risk Score

Malware Insights

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

The PDF document contains a link farm hosted on compromised WordPress sites, designed to redirect users to malicious content. Heuristics indicate the presence of a link farm on disposable hosting and compromised CMS upload storage, strongly suggesting a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2a9c9e4d6---zexibagufogiwumuzu.pdf In PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/39333558467.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/c9ab90fe6fbba0760ecd20db14ae1905/79152722403.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8bsm9grj3befv97iqtbt4447n5/jawipuxuwu.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/49177467311.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081988fca31e---menigulevik.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/58be00b2b69e366a42e4d44f798ce7ed/bamajabedigamukezeru.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/551922226a920035bafd124493bc1efd/kuzefesujuxabedebufisu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7a8d34b15751a344e3af51d1dc820dd2/samesawizememo.pdfIn PDF document text
    • http://medica-brno.com/files/7895316448.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/73201422647.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/a8ed57a428cf8aa48b79b867205044da/gigixelamoju.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/tikaxibubizepovikupitesu.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/92370628767.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082be9cae0a3---57237516701.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/jativefif.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e7122297661---81813289100.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210821110106.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a240a189bc---4830244661.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/63711303270.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610304beeafbb---bezurejavikifonid.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/38747513238.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/faboko.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42832a2579---44523331622.pdfIn PDF document text
    • https://bauarch.bg/files/bofomag.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/87152410495.pdfIn PDF document text
    • https://infotechbg.eu/file/486901625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=economic+analysis+for+business+decisions+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 17280 bytes
SHA-256: 84b528ae4dc24ea1706e6b3c2994666d4e606b3442039fd5fc68ef3eaa2e3a7e
font_01_sfnt_off00010c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001244f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244F 11020 bytes
SHA-256: 5fb464c213efb78f7b2156745973b3558ecea39c38fdbb787f603c2d326f5df7

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