Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f778209f36e013…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 11:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c2ba7eaae41b7393f0452f39f6d5177 SHA-1: 71341c6d4827e94be59e79437b21ee46daf26d8f SHA-256: 95f778209f36e0134109b79eb216d7e2b193ca03db9bb01bf0fe8a455150f49c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to external resources. Several of these URLs are hosted on compromised WordPress sites, suggesting a tactic to leverage legitimate but compromised infrastructure for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tucholainfo.pl/userfiles/file/jofipavemebazuxesix.pdf In PDF document text
    • http://honda-vo.com/upload/file/rupenapogodekidewebirev.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/87548228360.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613057a41255f---50110003512.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/6983386338.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613645fe1b199---xazorimidejewiturekogi.pdfIn PDF document text
    • https://tavio.ru/files/file/91487923529.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/58614969698.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613607dfe5843---nuropo.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b277197335---wedavoxapugegorim.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/93920160064.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/42572032986.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/xisomaravofuwi.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/13669811896.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/63894645082.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/898520720.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/semofag.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/45027427515.pdfIn PDF document text
    • https://websbag.com/uploads/files/joxukenadejufigitoka.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/63467473774.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/zififilewumelusukaf.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/bifakejezapobin.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/28617937599.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7149ac06bd9992aa259c5b960616a6b7/dopupivugimumetokiwemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=3.5+spell+compendiumPDF 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_off0000d786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 17888 bytes
SHA-256: 3b700b7083783cc6e471b2c49ac29caa3b1394161abb0d5d7e071368b2399cc4
font_01_sfnt_off00010655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6C 10692 bytes
SHA-256: b45a9047ef1f8d0f57bca46239c6dcd57f8d8f45cf303a72b2b49dd3ee1f61bb