Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5465db0b46d6f5…

MALICIOUS

PDF

76.8 KB Created: 2021-09-01 06:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: beabcac190fae8dad7c75511cd04622d SHA-1: 8d4d063124e5f8391c80bb36d78acc91356ea0f5 SHA-256: 2d5465db0b46d6f5cd900fb61b6ed87e2e52ee4e4525cba1ba3edc54ac755c53
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress installations. This suggests an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://olsztyntransportmedyczny.pl/userfiles/file/gopil.pdf
    • http://nhadep30giay.com/uploads/image/files/75592271085.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/huaa1t6crg9525g68b31jm56dn/tatunawegidupuboxa.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/78401312223.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa9cdeff1---godixijevef.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacbadb42a---36154950126.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077bae2b2b9d---jobataziwe.pdf
    • https://butchercurnow.com/img/shop//contents/32948848026.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/04efe02514721f86469fde5f7526088c/15705597711.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/234a97ccd0aafb156da4ff156a8a1614/46387556504.pdf
    • https://oklogistic.lv/upload/file/37048353642.pdf
    • http://mopron.ru/upload/files/81722754015.pdf
    • http://www.kymkarajok.net/tiedostot/files/75893494107.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0c51e1170---xisofininiwovonidavitofis.pdf
    • https://jjpremiers.com/files/nevedufawilajexavababex.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16095fe3d99f47---legugewawowumor.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/nobimetixoruwera.pdf
    • https://psychologgia.pl/Upload/file/3400087947.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/187039837da30aa1a0e44649fa36b9a7/67287832730.pdf
    • http://svsteinfurth.de/radsportfiles/file/ranepevodutivusujokabe.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607925ff1d987---18329660071.pdf
    • https://digireg.sk/upload/mimazukorefajijimurarugu.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610d7a17966ed---kagikurunanibozotiro.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=learn+ms+word+2007+step+by+step+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_off0000c97d.bin
7641abd84e732e5736cc7640cbaea09ee29844da3bd3dfa43d43a4e653280147
pdf-font-stream PDF embedded font (sfnt) at offset 0xC97D 16256 bytes
font_01_sfnt_off0000f3c3.bin
852e655ad7f2e9d7933a43c17db861f899ddc6a0765b905ff723e63f5047c557
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C3 11112 bytes
font_02_sfnt_off00010d98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D98 16792 bytes