Malicious PDF — malware analysis report

Static analysis result for SHA-256 172a860a33a63f27…

MALICIOUS

PDF

88.2 KB Created: 2021-09-08 11:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e2980a2536e50cd5f34ec961ef0e93bf SHA-1: 69afcf87fb6e6065b738f87582c3c1b3022657ff SHA-256: 172a860a33a63f27d2dab5265eb0d6ad6f4630c96f8cc730a4a53a2fbb976713
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of PDF_URI and EMBEDDED_URL heuristics indicates that the document body likely contains clickable links designed to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://oniceh.ru/uplcv?utm_term=mcsd+certification+questions+answers+pdf PDF link annotation
    • http://worldcar.jp/userfiles/files/kevomegazaxekebipu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf94ce43e5c---93789012208.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/nafujunumiv.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb644276fc9---78988563245.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16116999272fa9---99566543748.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607288702a6e0---27573938671.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-28/20210528004835753764.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/ca26f353543997756058e4a87c072020/22068648260.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/2032561300.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/soxun.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/202183082361438.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/74599625752.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/081f530acad6bc1fe826503e796c1d31/75648645236.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d7139bdcb---52492947044.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ed2718d65---nisusixumo.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/91315745919.pdfIn PDF document text
    • http://abworder.com/uploads/files/xiputapenajeranuna.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/77364693858.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/235b5021e4f40fa70fa0ec72496324c1/35309113929.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/84421799756.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/f6ebd867c400a4f4e405f8285d81cb7d/vovivodedekizu.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/7b601841c413b6c425e2ef003d5311f5/xujobanebalorurije.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///zezosorigefurenijowi.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076127f17185---larokeparujazepariliwoke.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/fca16e83fe9fec1a6f2d853f1edbba0e/67391663370.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_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 10892 bytes
SHA-256: 838f88f751aa9bdfac8417c9eb847debfc4bd2e705417a441f95c114f11a7be0
font_01_sfnt_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 17536 bytes
SHA-256: 8ed297b55bff5dae426478f7eee829b47b62a5633c81a34474f93084c65c52b1
font_02_sfnt_off00013a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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