Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f7027be1b8c950…

MALICIOUS

PDF

85.9 KB Created: 2021-07-02 10:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7412ac79f2dc1f539fa663017c332916 SHA-1: e2864b97d1a7ae94cca439f69ece57b47da4c952 SHA-256: a7f7027be1b8c950f7dadc79c8bd215b785d9ed673a136c4f17793229870d1e1
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to redirect users to malicious sites. The presence of external URIs and the nature of the link farms indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beba9f17c63---28867224840.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/84616944479.pdf
    • http://ulrike-mayer.de/userfiles/files/sabaposedaxonuvo.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2209754fc3---zepojexu.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a08c60f338d15818d29053f8dba1bf68/solinun.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/hkktng1kduq9ob26fu65cnr6ds/wifudumuzamajexomiguka.pdf
    • http://playbabydoll.com/userfiles/file/rojawajefidam.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/914f55f5a7a8ee9611e4bfe7fdd0934d/63096480634.pdf
    • http://talleresjpg.es/img/file/394590164.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5dc37942a984facf886344dcf148fe9/37590554542.pdf
    • http://mt-filtration.com/uploaded/file/115872824260cb51aa3c815.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/5ag0tlb71p0s0ehfu07trr2ne2/rizuduzebafekadoserifiwe.pdf
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/pibezine.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c07464405d5---70705455484.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/dcfb6b38f983e1b68d75b5b5450ed16b/tomala.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b04ac48ea532eef997d6ab4f619c97b9/93928003711.pdf
    • https://angelsstaff.com/uploads/file/9787221079.pdf
    • http://luatsuphutho.com/upload/ck/files/gimewatodimutezoz.pdf
    • https://callalilyvn.com/upload/files/23147408928.pdf
    • https://mebelihome.ru/upload_picture/lesedotaniwu.pdf
    • https://venefoil.com/ckfinder/userfiles/files/30520974333.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bd6e513eb---49496192085.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf29d0c5afd---pajetasem.pdf
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/zokolimomejigeduluvimip.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb601685dd5806898aaf2dfb56f3d5dd/xefigalozuk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+edit+out+text+in+photoshop
    • 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_off0000ead1.bin
b681fc8e30bad89f65d616ab8cee80af32b552bbbe68face3bc524a6051e231d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD1 17460 bytes
font_01_sfnt_off000118e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118E7 16792 bytes
font_02_sfnt_off000130fe.bin
a5a192482d6e7dae3e4aa0c21bc3f9029ec32a355b3e1ddaabaf45b7de6ae2a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x130FE 10460 bytes