Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35e62d4ea7b5de4…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 00:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cce38e1296baabfaa3b5ca7399e98f06 SHA-1: 554627dad5df7aa2d97548e869937c43b0b67e82 SHA-256: c35e62d4ea7b5de42af151cee634e4d645c428ef5822bf453c49d7d75f5d298a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The file is a PDF identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The 'SE_MFA_LURE' heuristic indicates the document's intent is to harvest credentials by tricking users into confirming MFA requests. Multiple heuristics point to the document acting as a link farm, directing users to potentially compromised websites or disposable hosting, which is a common tactic for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://stefani.cz/fck/file/bototudur.pdf In PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/87709776731.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134cea0c47c5---28123235511.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/fewujupetawa.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9746301b---litubetilikotufidabem.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/1158728644.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/gusizusidurasonikiwese.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/64005683950.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304a499f970---10112301783.pdfIn PDF document text
    • https://digicpictures.com/downloads/24074778689.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/62359284470.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/bokirogos.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137c64f57847---bakalegulizamefixelegewiz.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc88146f64---30230770135.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135f3b871164---tugilozukavi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161340bd9a26bd---binulalanikaziro.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210909_213443_3664.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/36361467208.pdfIn PDF document text
    • https://masihpt1.com/contents/files/jifavi.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/varuzizasuwutavozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+make+android+securePDF 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_off0000dedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDC 10752 bytes
SHA-256: b770d03ec711a0e60f4b8751825414150b7cf80a527e563a6af01830ecb3614c
font_01_sfnt_off0000f79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAF 18504 bytes
SHA-256: c6d8d282b7d9bcc5343e0be742210be5a22971ec9c9678871b233a50835a6d13

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