Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9630974a32b2f7a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 17:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8e42638455f41172cfd5979ee55ee02 SHA-1: 9c7f3bb86cddba760c898ad141227642b2c02979 SHA-256: d9630974a32b2f7aa41d906b4f97e8250d33e552d4f3930e9cd32637f59702bc
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 compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ahzycw.com/upload_fck/file/2021-9-15/20210915181829997096.pdf
    • https://decisionstogo.com/fck_image/file/zakorufavumenewenavo.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/raberikagotapebeligi.pdf
    • http://lmtechsolution.com/userfiles/20372692210.pdf
    • http://agnieszkapawlik.com/userfiles/file/21503679221.pdf
    • http://tuvanthanhlapcongty.biz/upload/ck/files/23265217430.pdf
    • http://ongxoanhdpe.vn/upload/files/88054878251.pdf
    • http://alda.pl/ckfinder/userfiles/files/44319453059.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613334d05ea37---57959279950.pdf
    • https://truongthanhco.vn/webroot/img/files/riludalujivuvefag.pdf
    • http://bortran.com/upload/image/file/20210912035612.pdf
    • http://beveragesgs.com/userfiles/file/37668069578.pdf
    • https://communeouchamps.fr/userfiles/file/fipaburunalidimozuvi.pdf
    • https://theelementrama9.com/userfiles/files/vuzofuluzemafe.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133fbc086af4---1291007850.pdf
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/97040788823.pdf
    • http://soc-in.com/data/media/files/wejisoneriwitegasisi.pdf
    • http://desiaussies.com/ckeditor/uploads/files/44893254484.pdf
    • http://sun-tes.ru/files/file/mobidunetamipotekep.pdf
    • https://chilegastronomia.cl/uploads/userfiles/files/38241741404.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/rudotexal.pdf
    • https://ritascreation.com/userfiles/file/23004211012.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d790ef1844---50705636948.pdf
    • https://eetravel.net/file/zoletijowoj.pdf
    • https://officialbacknumber.org/editor_up/xisuwexutujosopo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=age+of+war
    • 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_off0000e155.bin
ae21d6ba2b03619928523d7e486d76f22ae68cf592fcb81380bfb961a300ceca
pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 9948 bytes
font_01_sfnt_off0000f78c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF78C 16792 bytes
font_02_sfnt_off00010f9e.bin
4ab68e3c400fee39f8610e791587059450eec03e7f8ca0839a561215e4fd6fb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9E 17220 bytes