Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c11c4a5c9d5a40…

MALICIOUS

PDF

77.9 KB Created: 2021-09-13 12:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b4b97f6368df73a23936067453b056d SHA-1: a0592ccef2f86aab90dc7a69b7fbc1405b1d9de4 SHA-256: 44c11c4a5c9d5a40f706aee839a882c97fc00eecddc5e67d8f432453c5421f22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised or disposable hosting, suggest a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to create a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=d%26d+5e+tasha%27s+cauldron+pdf PDF link annotation
    • https://chetanaus.org/bheru/uploadfiles/file/60712353714.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/rorunusebuvorixakinanap.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/65784673700.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/68875222099.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/2874786696133b3b368382.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/soxomotesadini.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/17965459294.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/kelalif.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/gogekafaro.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/mijonijavega.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133c26b3c4b5---zogidimirofiki.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/wexafezezejuwakotafeboza.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/wipodubefor.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/7473074472.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/5512f5c13f82eb57c9413af2cc65e490/pogopat.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f21974973ed7063fba3cfd51e782ed08/47843668590.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/77419978892.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/96132885789.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/jixekemadefanewu.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/dogimive.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/xikiwaxubevo.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/45000207443.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/1303726690.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/lelexugimipog.pdfIn PDF document text
    • 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_off0000cec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC9 18848 bytes
SHA-256: d3031a18cb59979cf83cd5d4b4e9e9fa7df0f6d107ff05ac38e05c231b3f28ee
font_01_sfnt_off0000feea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_02_sfnt_off0001118f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1