Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc09c4c43b436760…

MALICIOUS

PDF

83.0 KB Created: 2021-07-31 15:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 069315f5dcb7dc1fec0ba1d10b792cfb SHA-1: 7c2b7c3f01cf9dc97eb0eaf6fc4e760344f7b04a SHA-256: fc09c4c43b436760d91772d9d4d36523f36ef8f0a94c1025f484e0486ff3a13a
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 high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external websites, many hosted on compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to lead users to phishing sites or download further malware. The presence of external URIs and link farm characteristics points towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=ncert+science+book+class+7+solutions+pdf+hindi+medium
    • http://etre-belle.su/images/file/20747835324.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/d590f81199d6dab84d6071f52b924795/pisupitatarerevuvidafula.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/jeked.pdf
    • http://www.biotanika.pl/upload/file/81188467281.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7ae58fbd0---29958501899.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/umlp2mkadpjani0ltelcan7dj6/31000064220.pdf
    • http://tourister.kr/userfiles/file/nopajodo.pdf
    • http://etpatatietpatata.com/userfiles/files/xuvalabetap.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079146f6c1e7---85618662118.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094458736d84---muwigoduwoxesipalov.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7153c704988ce9f5a4a96bfa14dc7498/88493600509.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e976a91c2c---35479120915.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765bfdd26ce---xemowuna.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/35cb0adabe0284d7a3a6cdbed83ed276/45995996658.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-6-21/20210621125329832475.pdf
    • http://centroolosprato.it/userfiles/files/42398608324.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/fl8f4j6sfd2he9otal59piqqlk/wavotug.pdf
    • http://hondatayho.top/img-ngocbao/files/73339374625.pdf
    • http://siembra.me/uploads/files/zixuwupufivujoxizezutuk.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/72ff41bf253d4958b57b02dcfea39377/37259568843.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/1152d7ffd3b9e3bd5ff54f0bd3218a16/2301849893.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd7d75a4ed---65010326038.pdf
    • http://nfc-lampang.com/user_img/files/54515245448.pdf
    • http://riskhedgetech.com/uploaded/file/118714332660f22aedbcb95.pdf
    • https://kawanmto.net/contents//files/pudedusume.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_off0000e125.bin
f783cf21c046dfbb2ff62c7578c3c37b797c8ea79ada5498b938fbbef1228712
pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 11244 bytes
font_01_sfnt_off0000fb29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 16792 bytes
font_02_sfnt_off0001133b.bin
ab88119ebd746b99a2b049ae25ae4a250e7f8f7409d4d0f334945f7b61343fb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1133B 16504 bytes