Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cdbecc8389761d…

MALICIOUS

PDF

69.8 KB Created: 2021-10-04 09:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8de177a1cae9e57d33a8eaa3cc34df36 SHA-1: 10f28c585044e76f14b1cbad39b7392d3030077a SHA-256: d9cdbecc8389761dcc4d73629bb8c146def20637bc56b076af25a1ec2fd98d0c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded links pointing to potentially compromised websites. The heuristic 'PDF_IMAGE_LURE' indicates a common tactic where a screenshot is used to hide clickable elements. The numerous embedded URLs, including those on compromised WordPress uploads and disposable hosting, suggest an attempt to distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://infrive.ru/uplcv?utm_term=efforts+and+results+quotes PDF link annotation
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/10869485953.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/jilagek.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5c3710831---bijojalalafonovexakojuwa.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/wurumavesefamopob.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/muwipufug.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/57520229282.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16155c190753e3---80118154236.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/wujojoxagawovinul.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/33449725837.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/68353708712.pdfIn PDF document text
    • https://ismart99.net/upload/files/98708767746.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/dffb17ef545a129e083a9886f777d059/wavalikifigoro.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/81090449775.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/89309221461.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/86622591038.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/89181976877.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/s89rg8gdlvufo3gh9j9b0oo9v3/tixefudasigaturaruvedoz.pdfIn PDF document text
    • http://njxinbell.com/upload/files/tizowejizajizu.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/13658276035.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16149d5a347cdb---wigijofazikekozek.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/jiligemepume.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/43801506482.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/pegenoxiluvusedinaroziseg.pdfIn PDF document text
    • https://tekartltd.com/upload/files/82021851258.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/xekuzezogukukeliwobijoxin.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_off0000b419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC30 10484 bytes
SHA-256: 3edfaad715c94b0c565469df8c3edbbb42234e28d121bbd9a278d97d2307908f
font_02_sfnt_off0000e3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E6 14344 bytes
SHA-256: 2a407556c486dff0c4ff7cdb18bd8d5299c0825c7df1933897c762373bbd3148

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