Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce8f5a2e60365ee…

MALICIOUS

PDF

74.1 KB Created: 2021-09-15 10:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6dba4f233a83a5bcca985fa2882a45f6 SHA-1: 2b0b8416f62be73a528b8cc37b2d100f6f7bac46 SHA-256: 9ce8f5a2e60365ee171224a316d99bffa0b27df63ed76b508f4545a96ac6a21f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the primary attack pattern involves luring users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://huntic.ru/uplcv?utm_term=quest+town+saga+mod+apk
    • http://xn--j1aii.su/userfiles/file/44095699514.pdf
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/wufemunekisomuj.pdf
    • http://koppeika.ru/userfiles/file/motogademirumun.pdf
    • http://sys-svinding.dk/userfiles/file/soleturinixiduminijinepeb.pdf
    • http://directopinion.biz/uploads/FCK_files/file/72700590940.pdf
    • https://jooli.ru/ckfinder/userfiles/files/lemisenip.pdf
    • https://takarasushimn.com/userfiles/files/wutotikusumaxuderiduxodol.pdf
    • https://epiphanych.com/images/file/xiruxovegewiravuvexa.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c6c20090f---fanebub.pdf
    • http://mhzsolutionz.com/userfiles/file/dawejurudibamaxupobewakam.pdf
    • http://studio70.eu/userfiles/files/felojuliwajogifalilevewuz.pdf
    • http://dasbluemchen.com/35680322967.pdf
    • http://denetimmusavirlik.com/userfiles/file/gidumixatozili.pdf
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/fuzumenunuguvafetojipi.pdf
    • http://polesprogettazioni.com/userfiles/files/bevexatesez.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614150e71615a---36780979243.pdf
    • http://i-physiology.ru/upload/vudafudifukotufunisobosi.pdf
    • http://wpchkg.com/upload/image/file/46470445877.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2c8cde681d677bb52313b75ce7b5c35b/99346084171.pdf
    • https://divanich96.ru/admin/ckfinder/userfiles/files/61327604246.pdf
    • http://eegbiofeedback-leszno.pl/userfiles/file/42334043841.pdf
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82794718818.pdf
    • http://falerisztika.hu/tmp/49160339851.pdf
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/36435074345.pdf
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/31919665991.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_off0000b867.bin
7b3f5491f852b24770d010119e24be1a87d26c79646434f6f6ed6f9c47021b75
pdf-font-stream PDF embedded font (sfnt) at offset 0xB867 19012 bytes
font_01_sfnt_off0000e9f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 16792 bytes
font_02_sfnt_off0001020e.bin
627c0afcf4606f598fa19b53fe2708c92049107f3a958f85661353276340aaec
pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 10836 bytes