Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ee97e2f056c423…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 10:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 887566d948d52cc0d43167d78a4cc084 SHA-1: bc32d0ec51043deb3897e538b9f196b38504a75f SHA-256: 74ee97e2f056c42379318f2ac1c1f72b609aa393121cbb8068d0909c9ab64683
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a050fc9ae51a2da7d9e0521b8f9aa81b/38924201800.pdf
    • https://capecoralliving.com/media/file/xebiwe.pdf
    • http://fosterfreezesantarosa.com/uploads/files/tukarerufadikivotorala.pdf
    • https://jnnjhansi.com/userfiles/file/97562307712.pdf
    • http://www.szphotar.com/admin/img/files/43864874498.pdf
    • http://ephtour.com/FileData/ckfinder/files/20210906_581770B1041E0053.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/81450876625.pdf
    • https://konyaalotaksi.com/userfiles/file/1968916919.pdf
    • http://atreve.eu/ubezpiecz/obrazy/file/31750850155.pdf
    • http://www.galiantsolutions.com/emailimages/file/norupowi.pdf
    • https://aksusu.com/upload/files/83903109050.pdf
    • http://yieldpharm.com/upload/files/sasomesikoro.pdf
    • http://niezapominajkowo.eu/userfiles/file/41070462808.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/1e978a69fe960b5818004bbf7924ca4a/suxumutozexafovumi.pdf
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/vomaxi.pdf
    • https://led7.ru/file/fegogezilawada.pdf
    • https://bdlvn.com/steel/upload/files/ginego.pdf
    • http://dga.gr/ILC/img/file/mosijij.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b55202719d141072906e2af66e56947a/figiwijigotelaturerapu.pdf
    • http://sreema.org/FCKeditor/file/87836516812.pdf
    • http://mcdanielz.eu/files/file/70527329237.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/i50qviurg3qqcgrh6464vd0qf2/fozifotinavepezidisi.pdf
    • http://lignumweb.com/site/webroot/uploads/files/zivilukonopapilamo.pdf
    • https://beeshark.ro/app/webroot/files/userfiles/files/marewamusugigawajo.pdf
    • https://markyatirim.com/resimler/files/wovove.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+decompress+a+rar+file+on+android+for+ppsspp
    • 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_off0000dc62.bin
26987e2b10baf94d629505f2e3dce0d5c6ff647dacc02cd7515d791de574be62
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 10860 bytes
font_01_sfnt_off0000f56b.bin
c5733721d7e88c8024d08a43ec16a96d74caecd9e4b4b08d1a163650ff658d46
pdf-font-stream PDF embedded font (sfnt) at offset 0xF56B 17848 bytes
font_02_sfnt_off0001236c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1236C 16792 bytes