Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb25f5f0ccaae84…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 18:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5f9b2daf4c60886a3117d40b3d8b21c SHA-1: d35705fb9f333425b784887f80ce71bb42169103 SHA-256: 1cb25f5f0ccaae84cb800b1a464764f6ddc68ba241a0b37838bab58f1dc3543f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of linking to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://potentialdesign.cn/userfiles/file/1631055291.pdf
    • http://originalbau.hu/imagesfiles/texajubasevakujerezaxed.pdf
    • http://linkingpeople.info/userfiles/file/67629106572.pdf
    • https://joebalogh.ro/imagini_ws/68875910266.pdf
    • http://ceramicaartisticamarsalese.it/userfiles/files/vexumetozevab.pdf
    • http://studiolegalezullo.eu/userfiles/files/15374336317.pdf
    • http://transchem-tech.com/Uploadfiles/files/74072458046.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613343f35d5a6---foxiligadabevesivelepemup.pdf
    • http://andlupa.com/userfiles/file/33033673494.pdf
    • https://alpinashop.rudy-ra.com/files/24949338492.pdf
    • https://lerivagedesmilleetangs.com/caningest/images/file/55357723058.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fce2c92408---94011038574.pdf
    • https://olamare.com/img/uploaded/file/notuvatufabapiguw.pdf
    • https://cantellodetersiviprofessionali.it/uploads/file/dodofusutafiw.pdf
    • http://pevak.info/UserFiles/File/ralewetalemikuliderolelad.pdf
    • http://aven.su/userfiles/file/19672149168.pdf
    • http://swiftnb.com/ckfinder/userfiles/files/xowisiraripololixela.pdf
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/97333146130.pdf
    • http://wjcopy.com/upload/files/dujipevotup.pdf
    • http://vocal.bpv.su/content/files/files/fatefetupi.pdf
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/xerikojadozojumox.pdf
    • http://imdmotors.com/uploadfile/file/2021091613383110.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecae8798cc---95272777047.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=all+the+kings+men+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df5f.bin
7f7432d1e9e6c7d3052aca780d0a0ecd90a07ebec7cd8e263eec09d7b9ac29b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 10636 bytes
font_01_sfnt_off0000f741.bin
f1762e823fc61da61d3166a2f5936ca2962be644f7316628f812ccc954a17535
pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 17964 bytes
font_02_sfnt_off000125ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125FF 16792 bytes