Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb9aed21fe381e6…

MALICIOUS

PDF

83.4 KB Created: 2021-09-09 10:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: f5f3668da213c354ee30158303406f14 SHA-1: ac9194fc7b5b39a1074ee8e1d45d38dae76c0eed SHA-256: 5eb9aed21fe381e6fb1dd866c10e4bde3c71b8e5e3343bf01ebd3f4ca2f0ae35
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=the+drudge+report+app+for+android PDF link annotation
    • http://ge-mak.com/files/nusimexonaxux.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/73662709869.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/89236546852.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/linuleroka.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/83ec5d0c2b68b357f2d8a78bd7372205/91142109209.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a07b56f0adb45736e0f5a4e4e5c67d28/barep.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/fefuxovefidivutidikugo.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/70492259703.pdfIn PDF document text
    • http://devison-matras.com/upload/file/43322778610.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/16407882909.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/5177143788.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/38247727537.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/jumiduxoti.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/aaab71c1b73725751e42430dc46e8788/tulibekalaguwav.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/pepas.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/13424741001.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/97364432336.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/36571434147.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/71616419289.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/df3fb9fa2cc2dfe1a01bec79a52927ee/dofusuvotigulabapu.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/43029093740.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/rukiwedanuduvuvaziji.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/ruvesituwuni.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/xejosemetazapovusu.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_off0000dfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 10628 bytes
SHA-256: 809ddf719509de68028f4460d35dff401c8b95ed4e4126147a9dd86adfd630c6
font_01_sfnt_off0000f7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E9 18324 bytes
SHA-256: 689c45cee22881dd629a155f4787f1d80386212ef4413ab85a84e8858b75be56
font_02_sfnt_off000127a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1