Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b97085ee6d0aba…

MALICIOUS

PDF

76.5 KB Created: 2021-09-13 05:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2ccc1d02ed40283b4ed9fe6fd611b29 SHA-1: a8518be5a0837e78cf6157de186c957176d1ab4f SHA-256: f2b97085ee6d0aba01198727272e519db3226fd49862747589fde4c0f92aef23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farms pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary function appears to be redirecting users to potentially harmful content, aligning with a spearphishing attachment tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://nomylo.ru/uplcv?utm_term=download+java+emulator+android PDF link annotation
    • http://banglenhospital.com/UserFiles/File/zidukixobe.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/58289206601.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210904073219271909g9yylrzvcyvr.pdfIn PDF document text
    • http://envigest.cz/upload/file/jalotewopafetebuwap.pdfIn PDF document text
    • http://fitviewer.com/files/file/butuwafevuxusigisuvubos.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/17521012946.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/buzagewemeruk.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/43412768732.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613bec821e18a---lapajuza.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/kanaler.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/gamotowapa.pdfIn PDF document text
    • http://carbontuning.ru/file/92414022870.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/45223988042.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/lepuwaku.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/saruderu.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/fipagexulularogogimifisox.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/79103330154.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/xakewavovamunad.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb5936a441---46493898132.pdfIn PDF document text
    • http://tchid.net/userfiles/file/fabaguf.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/809d7393524dd80e72e5a681faacbdad/kufuwewogexi.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf371bf4d---95924547042.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/32298218711.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/95ci54hpq8imq8q7oe0kj29rhc/zodidemebugigokutufa.pdfIn PDF document text
    • http://teifsepahan.com/files/file/36760510361.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EF 10624 bytes
SHA-256: 0d78bf29917ca499bcdc45c58d8152708aa351dd186855d2d2c64b74deb31c26
font_01_sfnt_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 17248 bytes
SHA-256: 66dee2683795f968673aa4bf3d9b566b770f664217ca993e01c64eb4b30f4f67

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