Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a3ad3b1f113c5f…

MALICIOUS

PDF

76.4 KB Created: 2021-09-19 23:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52ae17f46068e2ba014645b4175db83a SHA-1: 5a34c2e8bf7f37299ed0e00078256544cd374e6d SHA-256: 68a3ad3b1f113c5f3a753ad85ae9330d226c6b99d78b84995ae5a5e81a4179d5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress installations and disposable hosting domains. These links are likely designed to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=tyranid+codex+pdf
    • https://ipic.vn/userfiles/file/jadavadubazudoje.pdf
    • http://ebbers-schilderwerken.nl/uploads/files/jiwokavudaxebosinuko.pdf
    • http://nemeckystrakac.sk/editor_uploads/files/79395661512.pdf
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/tuzam.pdf
    • https://vgi-vn.vn/app/webroot/img/files/1341076280.pdf
    • http://hndgyl.com/v15/Upload/file/202192229178706.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fcedffa37fe70497214d5f386a2cb88f/fegobekaguzudodap.pdf
    • http://a-mega.ua/images/uploads/file/fejumotasupekevisipos.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614660bba217d---zomebunekepeta.pdf
    • http://hzbmsj.com/images/upload/File/wuvobelirokitigut.pdf
    • https://chilegastronomia.cl/uploads/userfiles/files/raxetaziliselunudigi.pdf
    • http://w-f-l.de/user_img/file/46677506744.pdf
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/31602010868.pdf
    • https://laetitiabernard.fr/images/file/59714119558.pdf
    • https://penal-garazh.ru/files/1759715452.pdf
    • http://studiomilano.eu/userfiles/files/74973033080.pdf
    • http://www.anclupnapoli.it/userfiles/file/33515206433.pdf
    • http://pribatu.lamilagrosaimport.com/images/files/36530954943.pdf
    • http://marchmontnews.com/imgs/file/vufezuxikifogabomo.pdf
    • http://tbff-bygg.se/img/files/jojefogezuz.pdf
    • http://elitaliaweb.it/upload/file/9171897891.pdf
    • https://bodymart.in/ckfinder/userfiles/files/zatojizozes.pdf
    • http://warmistore.com/userfiles/file/47833782741.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vixotuvesitojarane.pdf
    • https://deltaguvenlik.net/userfiles/file/31173787285.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_off0000c6ac.bin
1d73256ec7f57b18da7242138d01c180e3c3d05dfed641ed615b265c7b43f473
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AC 10480 bytes
font_01_sfnt_off0000de97.bin
82e6c7f93bc42b1f70e7c7954eaa8f35ab2ea16333ef4479ca0cd08a59e693fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE97 17592 bytes
font_02_sfnt_off00010c1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 16792 bytes