Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5af016fd597db3f…

MALICIOUS

PDF

77.8 KB Created: 2021-09-03 11:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d2ff46c748ac7357f89b9f0970a867bd SHA-1: 9adc3649d017450f2d098e78c09196134507d079 SHA-256: f5af016fd597db3fcc4f837be4a6809563329a0b6251f93443753cc4362b3ac2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. The document contains a link farm pointing to compromised WordPress sites, likely intended to lure users into downloading a password-protected archive. The presence of external URIs and the overall structure suggest an attempt to deliver a secondary payload, possibly via JavaScript, after the user bypasses the password protection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/2b56e841c7dc1daf015766c336e40d08/pojepepuwepedunufiz.pdf In PDF document text
    • https://alakharia.com/public_html/userfiles/file/pubupiligexekeruro.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/ad0431dd748d6aabe0b22e85c93aa29a/31412174066.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210824231147.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/ahlttu4hm9k0357t4e03l93j77/nirikubobakojuvexamis.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908b7df357c---28359870213.pdfIn PDF document text
    • https://inks.bg/userfiles/file/84712007075.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/fr7i0nn6vjv4la2gbngcb3bkhr/lisotugumikixow.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/15693674459.pdfIn PDF document text
    • https://renetravel.ro/images/files/53407515583.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/31sqsfj6f9a568putcncbfbms0/19848217577.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/92ca146586aed160fd477f13a0fee85c/61780129505.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c0d5015b3---movutugofila.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f37621a8ad---41240781343.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1627302563418812773.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/10551602566.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9e1f5174129af7a198c3d4cb4ada0003/vubofilanezej.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/13356688829.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/abi7qgup13gq4prit8lenkkdca/nenarokaj.pdfIn PDF document text
    • http://doer-sh.com/Uploadfiles/files/97257542088.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/df8c202811dd860a51475b76d7f067b4/93958067234.pdfIn PDF document text
    • http://vswet.ru/f/vevaditusowodesafuridexel.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/rotajaro.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092413f1cbf1---335863565.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b5f7f6ee43---kepikadabawoli.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/meporapuriloregukaleru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gs2107-wtbd+programming+manualPDF link annotation
    • 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_off0000c937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC937 17612 bytes
SHA-256: 7c8edd82f9f877146484a4a45b1a5bb93785d06e3dedb82765705f7dcd369463
font_01_sfnt_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F55 11344 bytes
SHA-256: 078fc7a23c9d22733867136a400f949a59a457b8fcd08001252753a73700a6e4

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