Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f67174625379d5…

MALICIOUS

PDF

95.8 KB Created: 2021-06-26 13:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fd87a5101ef70c3beb9a3b4b3f33736 SHA-1: 19a2c9d721379cf9cf33d77b7ee4305bf8b1b54f SHA-256: 82f67174625379d56eb4b5b86b94fbafc1db49752f31bdb6f61128e29c3c3872
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised or disposable domains, likely intended to lure users to malicious content. The presence of multiple PDF link farm heuristics and embedded URLs supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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 http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/2296090198.pdf
    • http://www.petercar0937494634.com/upload/img/files/putinewokef.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/0c2qlum5r713t6k660oqf0k3s1/45415277109.pdf
    • http://teckim.it/themes/userfiles//files/parunerewunuzogixipebi.pdf
    • http://zuche0551.com/upload/file/raminasenuvari.pdf
    • http://collegium-connect.nl/ckupload/files/45317334101.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/3712fa6a915cdbf0f71bab9cca8509f3/fapamowerowumudimopokix.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/77030b8cf3f2fa83864ab48f8945d2d4/26498800534.pdf
    • https://elesud.it/img_pagine/file/27645698589.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/h4aobmpegvi83jpd78dk3mvnv2/53429950688.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0e024e513612f1b39ba3163320aa68fc/dowazurazakoxagugaz.pdf
    • http://montaze.org/democms/userfiles/file/23768003773.pdf
    • http://aggengr.com/uploads/CMS/file/mujebewosazamuj.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0859b1728b---wiwelonavebovenikopabu.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/45548ab9866a6c2ba5316489ecce993c/7548777448.pdf
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/4265963140.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/98d9c81787f43507c48ce2ce560c08ce/54463195604.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/e5718f30b6f3ad094940b2023bcee996/gukuzexakuredav.pdf
    • http://energo-market.ru/sadm_files/babajus.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/pvisq1innfiv76q1rb1r1oehsf/fojogajoxinofaruju.pdf
    • https://limmaginebistrot.com/file/49645214003.pdf
    • http://fresh-j.info/images/uploadedimages/file/fuwukuxiwimazebipa.pdf
    • https://aulacvn.com/upload/fck/file/tizumebit.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097112e22a3d---35876385996.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=meaning+of+involuntary+muscles
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013b2b.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13B2B 18328 bytes
font_00_sfnt_off0000dd98.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD98 3464 bytes
font_01_sfnt_off0000eb13.bin
3c76b46ae6f62354983e7895562d8a05e46948c2f10840f2025788192f51aab9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 22564 bytes
font_02_sfnt_off000121b5.bin
a9a43069aca143583defb1c80f3e162bbd5849398086a4e3139840e7fc2616a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x121B5 10952 bytes
font_04_sfnt_off000158cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x158CC 16792 bytes