Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e3948c8a262f70…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 03:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c88b077b4f41eff28a8608f39b4425b1 SHA-1: 00eb4ea38656718dc9e6e0ea52dc1b44158e98d6 SHA-256: 17e3948c8a262f706e62885d881012d1d181dbb94820bd0457afcc1c51b8ce21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised websites and disposable hosting. The PDF contains numerous embedded URLs, suggesting an attempt to redirect users to potentially malicious sites for phishing or further exploitation. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://coretry.ru/uplcv?utm_term=functional+and+nonfunctional+requirements+pdf PDF link annotation
    • http://silver.jo/ckfinder/blanc/files/xisazudijeriret.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-8-14/20210814065331867575.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/wewenonidakiwatexi.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/fc9b4a8d2ec6d4a8c1186176e7c2e239/wapubawubomovavewetedu.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/wezibisitixob.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/pilukidi.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ac436230e7daf4e2a1510c3ba62de87e/loluniwikufovimapidupa.pdfIn PDF document text
    • http://schubert-hh.de/image/file/xowuzasujofuvazirazomor.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/99388239558.pdfIn PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/gunufaxik.pdfIn PDF document text
    • http://119pump.net/d/files/60567186831.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/rukopabudisapen.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/39256129803.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/25521123109.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210805102403.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/ggqr4ksmkboc9lnbbc3ldqi8q5/nategepefuja.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/49103524437.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/6913076745.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0d5563785---99362791753.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/e27bfeb14e3200f50eeba1411c8160e7/zewakulefedemaxuxat.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/waxoramerefosunajukomale.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/97109966908.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_off0000d320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD320 11004 bytes
SHA-256: 0af9d959f710db8c43f19feeaf57d0b9abb7171c0eac714d93cbea941adff149
font_01_sfnt_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001048e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048E 17448 bytes
SHA-256: 8fa157c4af270efa15123c310b0357146f83af6650d7ad2a7b1304ef731e8545

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