Malicious PDF — malware analysis report

Static analysis result for SHA-256 985c545ba1d3acc9…

MALICIOUS

PDF

81.4 KB Created: 2021-09-08 02:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff7d5d95751ab559ab26ede59009cffa SHA-1: c827ace2ea699d1633d4c222a88b2d552970e714 SHA-256: 985c545ba1d3acc9b338e743159cc20e79e64dc106fabe43cef2ad34d42e7c4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised websites and disposable hosting, a common tactic for distributing malware or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://vicareyou.com/userfiles/file/datopupunov.pdf In PDF document text
    • https://cissud.eu/uploads/ck_editor/files/54573962576.pdfIn PDF document text
    • http://securityguardsupply.com/php/uploads/file/lemeto.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/6nvig2pe4bomjf3vtvp560k7t5/wuwijev.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/8037340674.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/61211859594.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077761f01cf4---xaxudozosuvitoxonemok.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/2a438681f096bd61f77a05a5cdddd471/31316517546.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b106c2b54cc---12183035039.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/fonimoxi.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/butulujixuxevo.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/4967158978.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/6931236554.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/52242973099.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/fulomudufup.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16079f49838cfe---37015674483.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/84170085930.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c55b6b92022---lasojexajaxatetujekejap.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/60736764923.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d078f26135e01ef0e72b405d2862160f/jemilivazuwolagid.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/aeec3fdcc15e077a58029e71a58f1ad2/78187271866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=review+of+related+literature+of+eggplant+pdfPDF 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_off0000d742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD742 18124 bytes
SHA-256: 9e02358d569a044b537d130d954a273128fdbf12d10b27acd4b83e164935581c
font_01_sfnt_off000106c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C3 10804 bytes
SHA-256: b491620416a03be7d2498f19c9f977e0824fff71066a0ef98d66ce0b2f45ca79
font_02_sfnt_off00011f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1