Malicious PDF — malware analysis report

Static analysis result for SHA-256 37451fade21cee6c…

MALICIOUS

PDF

78.1 KB Created: 2021-09-09 14:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 16391e4310edc6ae5dc280f59c119543 SHA-1: b254d861bdb4ae62e76142af23d12ee3ad26883c SHA-256: 37451fade21cee6cd595105e52223f58623c9768b0837219b5ef45039f3adc89
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as a phishing trojan. Static analysis revealed a high number of embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8006

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 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
  • 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://pataniforum.com/admin/jquery/ckfinder/userfiles/files/sedozipifoged.pdf In PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/7897718396.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/59524086149.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/29151099833.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/vizowatilidad.pdfIn PDF document text
    • http://scantech3d.com/files/sobovazuwibipivig.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/dakujepowinoweli.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16131bf8153a1c---sogogu.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/wujeram.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/57068617423.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/pusugov.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109040430442129.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/43590675438.pdfIn PDF document text
    • http://lejonhund.com/upload/54646589839.pdfIn PDF document text
    • https://digireg.at/upload/gaverunegenitadoxepa.pdfIn PDF document text
    • http://telektrans.hu/editor_up/46598559093.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd5a4319b5---mojedigadavunarip.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/jupuresozoneka.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/ziwejazoxifinutubol.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/giriwizonuvapepizopu.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/pozulasosivuxutefenuge.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/95455348759.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/sqf3nvobl02a5kkviv15o5id97/zitabenolazetajufozez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=dog+games+androidPDF link annotation
    • 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_off0000e35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 10448 bytes
SHA-256: b3f16c08de5a6e31ce959ea22a82df56f978f395a9b4fa44e8451f82b778d97e
font_01_sfnt_off0000facb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DD 17032 bytes
SHA-256: 67c14f4b409261d2b6e85cd3d3e13af41a4bb3b724476338c7508ebe17424687

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