Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab5063a7b27ee37…

MALICIOUS

PDF

82.3 KB Created: 2021-07-06 14:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a9ae534c5189ae0259c8ffb0dc4b0fb SHA-1: 08dbdcf79cad47c6e6db85526f2bc5943f732392 SHA-256: eab5063a7b27ee37e23f99fd84e3c8cd8abeed52129cddbc40d71d0ae10e24dc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external resources, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of algorithmically generated URLs further supports this phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://maconlux.lu/userfiles/files/jusujatuzuwoduwari.pdf
    • https://amrapalispot.com/userfiles/file/42760096364.pdf
    • http://thienlongadv.com/upload/files/9784002323.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/bilijomabazemi.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16073bee4d11ad---netidival.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d54e960b1a---87616847369.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd7b24bc72---rafanifunapeliv.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083ca2893d7d---nukowofagomaxul.pdf
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/zozaxijabajeboxokenet.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/teremegubepadopo.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/bd05e086b6400f44734cfcef59de644a/wevutavuramezumopamoxasa.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608917f76423b---gitax.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/t7dcjrro97hle5hdndbi2lic7j/kedisilukoxuwojekiwironiz.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5adb3024a4e9232218c3ce8c2367b3f5/27554362469.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f140552a3d---vuvosobijasurun.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855f57a90b8---nemix.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742803666a2---4399590081.pdf
    • https://transport-vehicules.fr/userfiles/file/zegokefavofe.pdf
    • https://trotusgrup.ro/ckfinder/userfiles/files/12542415935.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/6b052aee28f624b77433de29025595c9/19203176364.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eed1605203---69518957965.pdf
    • https://cafepiolho.com/uploads/assets/16687955542.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=objective+questions+in+c+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_off0000d787.bin
4ef5722501541eb7695eaac64382b9158b74c9210c700e6d91ae7874d49d6b0f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD787 18692 bytes
font_01_sfnt_off00010983.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10983 16792 bytes
font_02_sfnt_off0001219a.bin
cfb9c23084426d37885bc99566c4b3c96d0408df86fa6b1ae4fdf63a485e21e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1219A 10912 bytes