Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af8589364b3db54…

MALICIOUS

PDF

72.5 KB Created: 2021-07-18 16:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf96c36cf84f2b510d9f417ea5761db6 SHA-1: ab90cef4ef4e06224280f50b2cd7c3572717b419 SHA-256: 2af8589364b3db54fcb477804bfec30c5399adf6c1d10153a4050f2acd6f2522
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with multiple heuristics indicating it functions as a link farm on compromised CMS uploads. The embedded URLs, such as http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac27ea638f---ganadadegezivumebuj.pdf, are likely used to redirect victims to phishing sites or download further malware. No scripts were extracted, but the structure strongly suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac27ea638f---ganadadegezivumebuj.pdf
    • http://beateromer.com/bilder/file/wigasalisisozaxiwajoj.pdf
    • http://www.insight-assessment.com/ckfinder/userfiles/files/wewanasugazudemopulogowez.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/c4a5989d63f552a80debba6e025023d2/lonixidimivevalu.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9a6900d00c6e76613b39c1c4a8a72dbc/poxaletiwen.pdf
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/38dus1u8jf3un0c2d8vk978835/63774206315.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/a3fb9f43bb0d2166b838857b67b27f57/pedotalodezukugesiropazu.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6ba209b3f---81842982727.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbc03d25df---nubozadagudimiduf.pdf
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/87551303786.pdf
    • http://juentai.com/userfiles/files/38342057208.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35ff9b76f6---fupobujixepadizatudozakuj.pdf
    • https://nnkcreations.com/userfiles/file/34149994753.pdf
    • http://indago-rovigo.it/userfiles/files/solametapibifufirazigek.pdf
    • http://dancephoto.ru/userfiles/files/pesedubaginuxedipodi.pdf
    • http://ateliergermain.net/sites/default/files/file/boxulixoba.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da40e4b275---65460116538.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+ct+scanner+ielts+reading+answer+key
    • 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_off0000b842.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB842 16792 bytes
font_01_sfnt_off0000d059.bin
1b273ca1a80d3118b1481c2c07ba180e61d02438f8b13b95f8be512fee0ccde8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD059 10784 bytes
font_02_sfnt_off0000e8fa.bin
b98eab393a8e2c7014d00aecd8aaa219dab869f326d32cc61b093203c412c832
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 16904 bytes