Malicious PDF — malware analysis report

Static analysis result for SHA-256 f837076bc0927187…

MALICIOUS

PDF

99.7 KB Created: 2021-07-04 13:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ca7fa449dc78b514a1881b4165cc7da SHA-1: 8a7f6a8463d2017fda959d3bdd5e47825084ae23 SHA-256: f837076bc092718769b986e4ac16375b1b3976879c6fdb319ffde07884a59332
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload storage. The presence of these links suggests an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://nesemlak.com/test/images/uploads/files/69979167702.pdf
    • http://baobianhkhang.com/upload/files/41965099945.pdf
    • http://ateliergermain.net/sites/default/files/file/66254712571.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160994259548c2---6663785991.pdf
    • http://m2m2design.com/userfiles/jinusoboruxeloroxosikutax.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec223c2b6d---55330829495.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dce044a342---11872123861.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074751fad358---88222213463.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/88b61dc79c0ba38e4a4a0e59d57db91e/vobaxijufawo.pdf
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6e022e269---62959661053.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/76b4a6998fe9e1f7fd4e72cc59905df4/mubaf.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f833fbb38acdcc959e5c00610fda0d4b/jotelikozexufomo.pdf
    • https://aronabritcan.com/userfiles/file/pasesijenevido.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093cd801c5f0---61691214607.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608116d40d4de---mananulozudupizijolupop.pdf
    • http://caphegiabao.com/upload/fck/file/471575469.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/5fc73c6833e8a3afd3dfdddd72cc4ca2/47532077221.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5457729c9---sirewodorarudipow.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16081f5a658127---limaminekuliv.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/148c3cb74f6c8fab29080c6179f7eb41/84654801515.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/k1j414g2cak3qr57udngs18cpd/jajizujumapetufemudu.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13ed835ca---welekase.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c949fd9a83d---4956596555.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/os7ke5qe86ue7maa0havhg84hk/60124539952.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+oversoul+by+ralph+waldo+emerson
    • 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_off000121d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121D0 16792 bytes
font_01_sfnt_off000139e2.bin
5100c76c5152664456ae54f00e57ae25808c64c3e7b75fc36318a1703413030b
pdf-font-stream PDF embedded font (sfnt) at offset 0x139E2 17744 bytes
font_02_sfnt_off00016848.bin
8cdbdad856988f8613dd83fd8795a668cf97f5dc83c0915ba6c9f2fc7b0920ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x16848 10936 bytes