Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e06c0e9e932e2a…

MALICIOUS

PDF

81.5 KB Created: 2021-06-25 22:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 049b8b10277be86bd55c4c3099fb6fbf SHA-1: 44fa6e458ea2bee054c89962335d712777235ff9 SHA-256: 08e06c0e9e932e2af71b5ede5f09e30f46b70c1f7f9e7e2ac73fc8c2787c27da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites hosting other PDFs. This structure strongly suggests a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6b8193fe---kotegejopute.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/3d89d0e696e10f799b9ad813bc2d1202/63320222588.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd03f584fc---95421626522.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c0f022ae1---43974137442.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/4v4a3bo19bdnvnpg3rp73s1vne/vepobukozekomakitepomuta.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772ada9f927---golufez.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/4de6d6a6b1418eade8efeb65a3ae92a3/53617660722.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30e8f2fdf---24435693093.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/zalasifofabizar.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14cb9bf19f---78073800014.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e016c148f08c9c73ed06382eb25415ae/jenexibaw.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/442309b4d98f6343fb088f9409127be8/jawir.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b48bfa77346---rigojobisizeb.pdf
    • https://atpl.aero/ckfinder/userfiles/files/bunoguzudo.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160883c1b00cd6---12282421998.pdf
    • http://rauvuonsach.net/images/uploads/files/nudibibewigakeje.pdf
    • http://stacjaregeneracja.pl/userfiles/file/50842752739.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/63a86ccfe4659f2be7bdb84845ba986c/jorusomex.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608b488014374---312352066.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/pfvms0c71j86iqcsdf5lpld42b/91148432213.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e9d5c70d6---5674505888.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d49db48bf1f---kosiwolu.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb529397ad---61717226348.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dol+to+huf
    • 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_off0000dcfa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFA 16792 bytes
font_01_sfnt_off0000f510.bin
7a1c079198441a6e04dc1c99ca98848ccba343f7afa44e4dd0d99472a828745e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 9652 bytes
font_02_sfnt_off00010a21.bin
fc2a2aa0fefa6138e9510001fb2ba4c6a6047dc85deda4b7209c5b41d7878b2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A21 17536 bytes