Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bb63a6ccf7b76b…

MALICIOUS

PDF

84.1 KB Created: 2021-06-30 08:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4e02089173395663d1a81afcc68a907 SHA-1: 0078760c629b12cbdfd225d1b744a7e248931a3d SHA-256: c3bb63a6ccf7b76bfc0d4e0b8ea84b84b6fe5ce4e39a8f6f349feb3e20529e98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://medvor.ru/uplcv?utm_term=sewing+workrooms+near+me
    • http://fonnepal.org/userfiles/file/53030139546.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b35b6436a---49923878136.pdf
    • https://editionsitaliques.com/userfiles/file/segozu.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/5a878b295d8cd2951b10207796bb6cf2/74226554314.pdf
    • https://drsubhashawale.com/ckfinder/userfiles/files/jelezixizuwaxibu.pdf
    • http://allg-gyn.ch/userfiles/file/gubudamuregaxudugoxel.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cdef0c9bf---87171664098.pdf
    • http://poltinik.ru/userfiles/file/zigiturawukarigexop.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/7fda3a7ae0874483fad6ba4a002d23e5/mozutilufosepanagidag.pdf
    • http://say-international.eu/userfiles/file/nabik.pdf
    • http://soleilboo.com/images/uploads/files/vazabelevogejetulaseburit.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b091061ed06---73729103744.pdf
    • https://bnovum.hu/downloads/38202385186.pdf
    • https://oilbasaro.com/web/images/ckfinder/files/20210615171216.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac896bfaf---93813136483.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/b5d652cd5cdb424093cb3abb97c2fa59/xebofunoxuduxo.pdf
    • http://allamericannursing.com/userfiles/file/75440695732.pdf
    • https://editions-tlp.fr/ckfinder/userfiles/files/11171630178.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/4e2f4433d57020708ef835887d9e0d8a/berikifu.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/t0h7lkqf963iifb29i0icdm6mi/mesafodivaxovuge.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cd842a34d5ad7a1c4c90625a6ab16358/30178376707.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/3727be32f6fb87a4360f0e4db1d85626/52777416877.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/75637e5a61d089bab713ca9762451ffc/46985639959.pdf
    • http://beveragesgs.com/userfiles/file/57713352013.pdf
    • http://studiosiriosrl.it/userfiles/files/rujivakugopiwojitole.pdf
    • http://podiummoda.ru/userfiles/file/xokiwakufozigejowu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e595.bin
6e28bb046da608c2c80fc6f0eec352c295ae39070d7113af1d183b1e1c5b598a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE595 10560 bytes
font_01_sfnt_off0000fdb8.bin
139d429197a93e9db2dc31d983f39124e41e649756b624aa37ed7883ae9a66ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB8 17524 bytes
font_02_sfnt_off00012b26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B26 16792 bytes