Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc35556b91e8b582…

MALICIOUS

PDF

86.2 KB Created: 2021-10-04 22:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aefe0692005f311be331bb495e5d1689 SHA-1: 1fb93456063e321a6b07db0b9bc7a310da79396f SHA-256: bc35556b91e8b582bb21b14acbcdb6b4d07b7ca797be331cbe7de973eaea3f46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These URLs are likely part of a phishing campaign or a distribution mechanism for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=volume+of+fcc+unit+cell PDF link annotation
    • https://pomacanthe-art.fr/imagebeforeafter/files/xipawuwur.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/nowinanaja.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/5564643996.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/14725108602.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/devatenuradagofunaretum.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/70647440792.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613744aeab901---31505810591.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/32492616480.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b61a4d06a946e53aa81dcedb8be84388/zugexafuzowiwasugon.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/33387230881.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/denomizipuwitadowe.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/17742709862.pdfIn PDF document text
    • https://strechybenesov.cz/content/vuvixevejowasojanugusomuv.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/24472881962.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/56590238950.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/24102962336.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/82915978953.pdfIn PDF document text
    • https://superpart.com/files/bubidofurazesekewurameso.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/66115874478.pdfIn PDF document text
    • http://proxima-design.cz/files/file/41326862831.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/60791506396.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/womor.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4ca9016391d3e289730492e615cfd4de/80055792439.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210921_F9A26CE60E436379.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/kamedazoro.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16151a7eed25c8---78102911732.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_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCE 10136 bytes
SHA-256: 83e0c26d8d095b604a630e65b5a4318801b789d1cdbbda48d54924de6f161851
font_02_sfnt_off0001146d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146D 20488 bytes
SHA-256: 142b5dfc7642a27de012a50c55afcfee34e08fa2a259541e2d48a9a36ac27bfc

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