Malicious PDF — malware analysis report

Static analysis result for SHA-256 625232169a30b0b9…

MALICIOUS

PDF

80.2 KB Created: 2021-07-09 07:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69ca0d8dc5749ac0834990082e541d80 SHA-1: 3e0df567bfccd93c9204d2d263c8f015e69086eb SHA-256: 625232169a30b0b91734482aec3cd0db7ed73c510495eb03932aca22795b70ea
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, which are likely used to host phishing pages or distribute further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially track user interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8b62f48317fa4aa3e77251df22cda989/16122257717.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/5e51a2fc6cd134e80ccfc3b01d46c2dc/vivomu.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad2348555e---nipupimujawoxo.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/9vpag1natneljg5nkj0g4qnff3/surekazepoxope.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/06da41cb6fb0e28e63788490737e5136/davojebozisizis.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/vckm1n5hmk6ucvtrl3k99ab0nq/46234675138.pdf
    • https://nanyangtextile.com/userfiles/file/74340476975.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/453bbf7e65f0d2dab1279d7ae78d2a9b/42903677432.pdf
    • https://cafepiolho.com/uploads/assets/lilavomumotasatijesiw.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/kiwuvuxoso.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607578b37a3b4---gotelamoxex.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/db51d9d206b7df5588183c164098d0bd/53438629525.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/fdea150aa9d86dfcccc66176bea380ce/83148540824.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/0ag8clqverqo5dn9m0k8mqna53/40455004507.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/8fb763b68a530aae611b41a3885f42cd/91428560297.pdf
    • https://evergreencans.com/userfiles/file/40675636330.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/66da82de73e8acd0390bc304464da2b3/vujajowu.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/e2d61e01bfbe245161fc68500c5cc6c8/dabezim.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/c09aa057eca1443d82b128c222578d08/lalunekipokelorim.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809a80cfead---82661521473.pdf
    • http://danies.ru/ckfinder/userfiles/files/kupanefat.pdf
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/89476617342.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/16493ffa940f01b6c4f99df806f384fd/savitedugib.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=greatest+3+digit+number+exactly+divisible+by+8+10+12
    • 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_off0000d19a.bin
a489873170e04b8b854f261c1c010a41be8149909bf4e9e3335477df36a99fea
pdf-font-stream PDF embedded font (sfnt) at offset 0xD19A 11828 bytes
font_01_sfnt_off0000ede2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 16792 bytes
font_02_sfnt_off000105f4.bin
4a7b3c3566e16f780b58692b690d46551de214cc22fc4dac6abecacdddc03569
pdf-font-stream PDF embedded font (sfnt) at offset 0x105F4 17196 bytes