Malicious PDF — malware analysis report

Static analysis result for SHA-256 66cc9cc40d4a7c73…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 10:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8adefeb5cafbb315029988d090ef146c SHA-1: 45239e8d906453053cd6230527275f49eb64a1db SHA-256: 66cc9cc40d4a7c73519ae7b7580e1c674b6109d71442ce518fed0fe7c79e604a
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded links, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malware or phish for credentials. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sabancilojistik.com/userfiles/file/farokenivufevesiros.pdf In PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/82771299595.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/nidafaxaxewin.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/jabolumipafad.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/87013401722.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/wifagivuvo.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b79ee233f---25987076343.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddbb8a1512---28036388601.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/64147964891.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/penaxunabololugedalaseval.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/fuwizizozotus.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/58077813618.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/silawuxudod.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161303fc138cf1---19833038254.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/49045005420.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/dj4gjcduk3a3irfqmo9fqcio61/59675628405.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/sudepazuwo.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/40291567195.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/4dba1c31d056da06dab4b981b021cb7e/nafadanulatedora.pdfIn PDF document text
    • https://energooptima.hu/upload/File/56100479575.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/jofov.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/31373803276.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/waxujitafisanigopiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hamraaz+apk+latest+version+downloadPDF 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_off0000e631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE631 19348 bytes
SHA-256: 7c08372de6c2d3b3a80303b280a12ea81e5364ce9854897d3430287c2322a997
font_01_sfnt_off0001184d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13064 10848 bytes
SHA-256: 2757a9eaba632809345b2129e1aaa18d4d045b59056a4a1b2bfd961cd1b10882