Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ec4a5fa1f0a077…

MALICIOUS

PDF

79.0 KB Created: 2021-09-16 07:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f8a33a45382ca9ef5a6bbb0653167d14 SHA-1: 69ea82bb3b945d51fe89c67a67c52394105bbd54 SHA-256: d7ec4a5fa1f0a077ba44cf9fab988ecef99babcb4e7eef0fe0a0f6ffab594278
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware delivery. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7217

Heuristics 5

  • 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
  • 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://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff99b48ec3---31694921946.pdf In PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/40g99th3r2dqq2r64jrfpgtatc/veveveriru.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/85405344836.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/gagokojajipuxodive.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/daminidada.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4b822ddbe---69390064186.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/4534606302.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/26379795973.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109090814294437.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/40894886438.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352e8d906ab---46967835692.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/85980955571.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/f4f0ca0a6f92f6612e3a355a803b2f8b/ninabadibepiliziwudote.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/gufejasonol.pdfIn PDF document text
    • http://boldogelet.hu/media/90799096814.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142084f480e8---motomibumirivabupak.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/70046245007.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/fofopowomasi.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/lopap.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/kagoxexifinopexivefim.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/jewixaxomoriguvapagudif.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/jazetowafolotibozarixi.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf70a0318f---13949044614.pdfIn PDF document text
    • http://merwepizza.com/upload/file/96650313881.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/49569588343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+emulator+pc+download+windows+10PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 17512 bytes
SHA-256: 92f0e98892a179f339e1a1cb91d24d2c78f200263061fee085db466fc7eb03f3
font_01_sfnt_off000111b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1