Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57dcde3ad5823a9…

MALICIOUS

PDF

73.5 KB Created: 2021-09-19 03:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e9d8841a627f4be5e7ef3a03342a4b2 SHA-1: d2c08fad75b29ca964c9f6e0b669038623311029 SHA-256: f57dcde3ad5823a94033e555dfe7474242c58b96369eb2413e54325c5c8fd908
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7671

Heuristics 5

  • 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
  • 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://drafthe.ru/uplcv?utm_term=best+app+for+dual+app
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6031e1fcc22ea298dc9d9a4a7ff000d6/23859501585.pdf
    • http://aptekarynek.pl/zdjecia/fck/file/zinusironigiwebimux.pdf
    • http://hurtmar.pl/Upload/file/24459456477.pdf
    • http://vibrobreaker.com/files/files/81217576822.pdf
    • http://4els.ru/uploads/images/files/66378357163.pdf
    • http://apsencollege.org/test/fckeditor/file/wofozusos.pdf
    • https://www.truck-transport.com/ckfinder/userfiles/files/vibepulodaxufinurawukoxaf.pdf
    • http://mylivediamondinventory.com/uploads/files/bavanulikuzaragor.pdf
    • https://hinodecoder.com/userfiles/file/59993027155.pdf
    • https://rmp-familienanzeigen.de/cms/files/lulitivosukakomubixedese.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/88307367474.pdf
    • https://madame-tina.com/ckfinder/userfiles/files/29119498772.pdf
    • http://dobrejaja.com/Upload/file/kejapasemokizezoti.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16140a44de0f06---jitojilugos.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/0c3303efcbcc54067a37ad513a91b036/wesixogunedapixezagut.pdf
    • http://exim5.hu/_user/file/29580444482.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e3fad26786a81535c103630a3eac67da/56319568700.pdf
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lobigubez.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140297dc5db2---soxodemoradebubibi.pdf
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/bujexuribibupej.pdf
    • http://www.leasebridge.com/CKUPimg/files/kidivuzeluvedax.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d00b.bin
768a9b5a3416d97b4da11b593fd27745394d6c7bff35086b856f3b6a415f019a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD00B 10448 bytes
font_01_sfnt_off0000e7f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F2 16792 bytes