Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d80eac96258696e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 17:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: efe26110858a3e7348b7057ec519582f SHA-1: 95084905c45abb3665f6ba614a22585da4d8039d SHA-256: 8d80eac96258696e53f575ea9fba53d5806d2fe19dd74d4fcac928283482103c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to malicious sites. The presence of compromised CMS upload links and disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=how+to+add+temperature+to+android+home+screen PDF link annotation
    • http://debnine.net/UserFiles/File/96281134145.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613047521889b---19607040074.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/jigomitetoke.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/48647612543.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/89053561614.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/282f05185fef5e06093da1ca5831918f/35547174583.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/mobabisifodet.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/7019550205.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/difunib.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/5699816780.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/webujunovagutix.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/2779867564.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/32028125174.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/99626595769.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/52135789505.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306898c801c---gitafazogedojejune.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/pinosik.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/753684120.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210912_B68297D9E33ACE24.pdfIn PDF document text
    • https://questyme.com/userfiles/file/68377557437.pdfIn PDF document text
    • http://twilaw.com/files/files/6352810588.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/45402119519.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/toraxatosunivabaresam.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/97672810093.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/58974528402.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_off0000d8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DD 18452 bytes
SHA-256: 2a7e6420daf03041f1827abafacd465d1c82a348ed6336c899627cb34e138585
font_01_sfnt_off00010890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A7 10912 bytes
SHA-256: 8cd9a44c495131f84519103e7d7242cf0a28f2111c0300480ad757dca18c491e