Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ab653cfe3a8d91…

MALICIOUS

PDF

73.7 KB Created: 2021-09-21 02:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5bdf1e6ca25e4548104a46d652f9446d SHA-1: 81b2eca0e19ce07da5398fa1330b1cc210c54e4e SHA-256: 42ab653cfe3a8d911c656aee319892506953ffb9618b3d99d8a3099e8ad8db47
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 links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing lure. The embedded URLs and heuristic firings suggest an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://dagvandearchitectuur.be/_files/file/11540162119.pdf In PDF document text
    • http://kipia-nn.ru/userfiles/file/41161301491.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8e074dd2---71789076238.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/fowutevujibo.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/zajofexisawejibob.pdfIn PDF document text
    • http://stevis.cz/files/file/nomoverotelerodedotoxub.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/nelijafadibal.pdfIn PDF document text
    • https://peterdegendt.be/file/bowumabedozonido.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210902_FB4401FD4178224C.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/82050026573.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/molidajuniforomesijexowez.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/59040291031.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/teregolamafeta.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/mumuxaworapobok.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/gajiguxikeda.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/0ebl2i7r0a9dq07ji2q2todesb/15569500407.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/4176914257.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133a933adc47---kumobadaweji.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/daxegemuk.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/finidoxizutakenizus.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/40746665191.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/tixawabuneteripinaj.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/50457540246.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/sabukeji.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/roxidodaxeriratulorusovo.pdfIn PDF document text
    • https://12shio3.com/contents/files/64173979783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+11+for+redmiPDF 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_off0000bf30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD747 10076 bytes
SHA-256: efdf835273173de388d72dcde7be713cfa8d09cddd78ef7fcb2948e7385b31aa
font_02_sfnt_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 16728 bytes
SHA-256: 61fa824eed20f2aaf0e2d8b7f91ac4705da970dbf947c9a12e39ebfa28796cb0

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