Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2bc27a21872fc41…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 08:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f78b61105a2f38e24a68ece61a602f1f SHA-1: 5f097e15d3837e306b59848ad35cb2a0fcacfc06 SHA-256: f2bc27a21872fc41ba4a2968ca1d3253b6eef78f9536922ed7ef0dce65c83358
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The presence of UTM parameters in some URLs suggests an attempt to track user engagement, likely for malicious purposes such as phishing or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cructi.ru/uplcv?utm_term=fortnite+galaxy+store+download PDF link annotation
    • https://cardion.dk/gfx/fckimages/file/putupodugufiviri.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0f164ede73cfc06af1f5ea0442c3aba4/7764103715.pdfIn PDF document text
    • http://beiks.info/public/file/tibib.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d3a5387f2---tanapasekelifore.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/5259812344.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/tepefekagugejas.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2b0c5ba08---74102772509.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/vadugatemeviwazul.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/86158258258.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fc93b18ce---jugirumu.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/89629989162.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/29842275511.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/34273549908.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/tubijosetedofisuzulef.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/noreduwiz.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/notitimure.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pekapilikorofolagamepa.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/61881109060.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/jebonubesigutos.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/radapovuro.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/gupajozusil.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_off0000d834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD834 18160 bytes
SHA-256: 4f8a4b295b2ca79894b9234719682898dd99094527ef2e4ba8195a15afa18f25
font_01_sfnt_off00010755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 10700 bytes
SHA-256: b2e29f9054abfeeebab4b46d268576d920c8394a142607513d9913c27103e0fe