Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e5fec5066c03c2…

MALICIOUS

PDF

87.5 KB Created: 2021-07-23 14:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4193857db668be9b6e130811b33302c8 SHA-1: ee2b716c2bdf122abc4bcceca49d0a78bc725dff SHA-256: c2e5fec5066c03c29feb3699495e79845917a3c29b77b45e1d92144f96adc547
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, specifically identified as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the URL structure and heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/7906608e3ab585cc8f1c233518660892/59389637576.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075c246226db---22977658840.pdf
    • http://zonwering-belgie.com/ckfinder/userfiles/files/wokidumosovawezik.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160947d5f27475---rodogofososevukujavipali.pdf
    • https://stillwaiting.org/userfiles/file/49757596002.pdf
    • http://hc6999.com/userfiles/files/dixazojiledaweromi.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a669231783fbe913d4a2f52c0338116f/72535980867.pdf
    • https://ivanda-commerce.hr/userfiles/file/dujoredigimowuzivezenineg.pdf
    • http://3bbb.fr/ckeditor/upload/files/81425563576.pdf
    • https://menu2uplus.com/images/file/terosodanurojudida.pdf
    • http://www.cerel.eu/images/wyswig_images/file/69430385060.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2daaea605b---2227624731.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745ef58459e---pefuvenoliwufatinowij.pdf
    • http://szpital-sulecin.pl/images/fckfiles/file/walodumolesite.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b79a0cb9383---11978226297.pdf
    • http://greatwalledmond.com/ckfinder/userfiles/files/mukonuzijugekawaralagoro.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608574762ac97---8804838613.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1e73817b64---25649933660.pdf
    • http://zigzagontwerp.nl/sites/default/files/file/sugevonifozijujinimanov.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d16c26aff1---5609422334.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607588086643a---dijeveru.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3c9949c05a5cb77157fef32115ce57a8/75403695477.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+does+it+mean+when+your+tv+blinks+red
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6720b85a0c499b193e802cac576242e5/fekovevipokadona.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_off0000f250.bin
239718b9693929f07a39def223235850de18f564db1f8116ac5a068e8e65b736
pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 17116 bytes
font_01_sfnt_off00011ecd.bin
b19e0ac7cfc5b4281c5f0476b448988793eb3037d554a600c0701b4583f8bad3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECD 11104 bytes
font_02_sfnt_off00013891.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13891 16792 bytes