Malicious PDF — malware analysis report

Static analysis result for SHA-256 5988411d633942cf…

MALICIOUS

PDF

87.0 KB Created: 2021-09-01 16:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4233a629bcedd0fa1874d10df0d7315 SHA-1: abc20cb3b98aedf1e7d0a4ac6992ca775eaaf962 SHA-256: 5988411d633942cf26c464d02367755bccb0fa092dedf54da93f083eb39f152f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves directing users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9807

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://catamma.ru/uplcv?utm_term=definition+of+amazement
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160941e13f2d81---fuvupudutedinizube.pdf
    • http://gtshotel.it/images/file/nijatezigonetoxoxino.pdf
    • https://artgreen.vn/attachment/files/wosebojar.pdf
    • http://ranjitabiswas.com/userfiles/files/15066540949.pdf
    • https://perfecthospital.org/FCKeditor/file/belijideravezixugoriga.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce1fcf720---33060612230.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/6augh4p802a4tiin7h1rfn49o0/47530758168.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128411a6bb4c---51461645371.pdf
    • https://myphi.biz/nbloom/fckuploads/file/26056192825.pdf
    • https://eghamatkade.com/basefile/eghamatkadecom/files/misaxavata.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/80a6891a102d3925f2e7321faedf4e94/bonaxixina.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/4t9iqirv4a404tdojvc7ubp1u5/93933062453.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/758acf6a9ae2bc8341de79263c899991/fuvesudeb.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/rba6jqg5775p5d42ob88rv2mn3/15187018778.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfd62ee6b4---vefewanavudokasenavipo.pdf
    • https://dailyiat.com/html_upload/file/nedixinoloxaxajif.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/zudozogem.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cdba8bb0213---42434044713.pdf
    • http://gd-weimi.com/upfolder/e/files/20210805105924.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ea36b33ac---zaponuwememikogomojenanap.pdf
    • http://instalace-charvat.cz/userfiles/file/64466065013.pdf
    • https://melz-feu.ru/upload/gasotidigizigiwekeset.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160946c0f5bfab---55751321351.pdf
    • http://lrpharmaceutical.com/upload/files/9885252509.pdf
    • http://marmaraisg.com/images_upload/files/26926777472.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e7197432aad---82795676229.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000e4a1.bin
89d4c11f4004f409b0edb8cf007d67a5a76224d71d1982d1d2b3b46bcd556515		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE4A1 16384 bytes
font_00_sfnt_off0000ce05.bin
f689d3ae35d3c66ccfedc83153e7cd3e115760c2731f7875109e2f501f2861dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE05 10124 bytes
font_02_sfnt_off0000fb2e.bin
95dea0628c1f93d78b60e89cd91b5c1f743810c83bd0580ffc96363f04f3ca95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 21652 bytes
font_03_sfnt_off000133f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133F2 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.