Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a99631eebb55247…

MALICIOUS

PDF

87.9 KB Created: 2021-06-27 06:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 117a6c18def5a62ffc9686e9507ebde3 SHA-1: 8aa80e989fa8ba9506fbfd160fd2395dbe0c31f6 SHA-256: 1a99631eebb55247ce0f7ecc635a3732ca6185477cb1031c5cd9d992d4e609ef
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm on potentially compromised CMS uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/76c2f79b6aeee34c44e93c3cc3baf569/wizipulasewudoxufowepox.pdf
    • http://hani-bee.com/userfiles/files/72648470959.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/kimazirodolafuviketeb.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d6c88b6bf9ba408e42439c01612c40c7/lamovedadisen.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e5c3eaa85---tejawugijaxusaga.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7a50c33e0---48518656148.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/92aabddc17db6939a9c40c383ed535fd/97978297051.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba2d773bcc---47480195728.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/8f9a7ee377753f7ca5dbc86ae19c8e59/35922051576.pdf
    • http://rdmsrl.it/userfiles/files/fupejere.pdf
    • http://maslag.eu/userfiles/file/kodiwibote.pdf
    • http://biaikatolikus.hu/files/file/77658608262.pdf
    • http://goteneplast.se/files/images/file/19199163894.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47e8c3cea3---zexijiwupojomobaxeru.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/826f4c12eb0780da40635b44926cc2d7/pepowudalejuw.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94b7239d61---39034298753.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bf62939da59---kizojopukuzilezipejijo.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/eeb676765c665004e0e24624c42c5a1e/sujiwop.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/704e9fe881de2dfcae5bfbc0ffd119da/58765757912.pdf
    • http://bularz-auto.pl/images/userfiles/file/55366802238.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9eb78b79a5---74120863575.pdf
    • http://interface-referencement.com/userfiles/file/wawewu.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/2137659629d5ea10eb6da0a1c123652f/58334179391.pdf
    • http://rainbowcaterers.in/userfiles/file/66108543794.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=scanned+image+to+word
    • 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_off0000f59e.bin
c08bb0d3d4c940d4aaaeeaf2254b63634fb98491111d4c6ed2f9e98f2f0f201d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 10660 bytes
font_01_sfnt_off00010deb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEB 16792 bytes
font_02_sfnt_off000125fd.bin
b029af8e8d842d2546c6905c39800da5ecb0b1de3624e7f3c446bfd9abbd91e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x125FD 17188 bytes