Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c937964007b478…

MALICIOUS

PDF

77.6 KB Created: 2021-09-06 10:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: afeb0051cd881f88e7c2968ace0a2e4a SHA-1: f1dd1bc067f5bf21d117fbe898b77948c81647ba SHA-256: 24c937964007b4784b2562789e73d44a8281a51199fd5a028cb5273643a7ef70
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://leuphuotcamap.com/uploads/image/files/xigodanunusuvenitavo.pdf In PDF document text
    • http://palami.by/images/file/81329314811.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/rijafo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d500e8964e3---90108018718.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/xilotonelofodamolimuwew.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/9276405894.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/luupmhdq3f8osvl4rre9ek9ips/luwevuterasemenevofexazob.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/76827852397.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/jiwuxuk.pdfIn PDF document text
    • http://asmolmerdiven.com/depo/sayfaresim/file/14360478151.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ffe0d3ce41---revisu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ufd7vakh3hv8h2gmht396ovph3/sidenejisaravonemakip.pdfIn PDF document text
    • http://lulanjina.net/upload/files/85976256066.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/7aaac7dee60a79bd687d2428480d4fb5/nofupexesetuvataxadagi.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/62488780120.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/1648a572da1815c2776b611c4a805487/zipixoripaxapib.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/sekogiz.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/95954786981.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/82842062674.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078118a6a9db---89349148188.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/pujutepumefosibexuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=tintin+comics+bengali+pdf+freePDF 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_off0000c1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EB 20392 bytes
SHA-256: 280320a2e4f8221b2d1dfe5447693bbb5f6b19831df5b214e67268a6b3a0e292
font_01_sfnt_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD1 11064 bytes
SHA-256: 737c311199c94f812a7f9edd0343ff432f685c616c25530acae396b746acb2f7