Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b4c3b6fb1a4e0f…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 06:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d07f85a302499f93adffd3ac70a59641 SHA-1: a1033745e868cd65ff93627b676540899c638450 SHA-256: 37b4c3b6fb1a4e0f748f5383a2f8d65d1bf156ca9670e46738592a7a6493c8f4
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, indicating a high likelihood of malicious intent. It contains numerous links to external PDF files hosted on compromised WordPress sites and other disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, as these are common tactics for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/3ae0dff77ceacd15ce02442afbc439f9/xisupigujetofowal.pdf In PDF document text
    • https://svingenieria.cl/userfiles/file/70135707949.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091122290428.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1644204552613791af3a6f2.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161432965de816---43817950844.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/a356529760215c8505f0b86a6528e7f9/zevowovigumotunepiwo.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16144756c9ff07---30037387772.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/63774477621.pdfIn PDF document text
    • http://slsnn.ru/content/file/sijurusomafomibirigifozan.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210913194706.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/bimisusafa.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/vidawaxawomi.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/jefazejabaxil.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/toguvi.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/76769818551.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/96227978931.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377788bc5b9---35845799801.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/kukadeduvaz.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/486497a472d6c5097ef731482b06df01/zeposalonazudodadali.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/sopone.pdfIn PDF document text
    • http://dsagco.com/Upload/file/69386552051.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/39093804691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=download+truck+simulator+offroad+mod+apkPDF 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_off0000d2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E8 17436 bytes
SHA-256: 32c9d806df7f82481a16f8782715fe3bfca79fc4bdbd65f3b3610bd172eba59b
font_01_sfnt_off00010046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001185d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185D 10928 bytes
SHA-256: de1a68e9cf21681b30858f89389d52363c080308d17176cf21fee8058cc3673f

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