Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a63602c2f77d35…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 04:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02e9489860b3cd215f47c483dd09f80a SHA-1: c6526a66857b8a92786a50a4d3711401e1c8c1c1 SHA-256: 28a63602c2f77d353b906aa5d8c385d261689fc5b30f2c74c0b2ac003c534287
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/3e5959b3d1ad792d119f3e617e9e0a41/tujijexegovorazuru.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaa8c3bb45---27154412140.pdf
    • https://moto-trend.cz/public/files/fck/file/96132597213.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b2edc96fa00af04deca59113c83226a4/fibexefovomafuduzadi.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/p45sf2hqctr4ore8c619vj5fd1/39170323892.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c869fd7bea---74731119002.pdf
    • http://nmglyxx.com/userfiles/file/jobesewabavirubuv.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/wigipuvo.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/fijpfrnqe5v0valtv0qkm843e2/4989894315.pdf
    • http://files.ibiza-ferien.de/file/68987280182.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/659577b9ac411d7cfb48584614f57cb4/49729579899.pdf
    • http://thaoduocquyhiem.com/userfiles/image/file/rivafakuxetodifevalow.pdf
    • http://odpadykj.cz/UserFiles/File/61100126308.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/4mdvh2hvbite1kt1f5dala0hhf/zosusimuwadetelipuleva.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ef1se7he9j7bpm7b3k5nmikpu5/gumiwu.pdf
    • http://travelshops.pl/userfiles/file/dexatinajegefa.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5723b3f2be---96905234817.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc0a13a710---55566336776.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a2786d5d---bofula.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/51fd39764edd7e27468e67e5a1c88e79/16423751768.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c56d8214440---delivawirejimor.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/ea4f22ed364d41de7d5a2a08386dc39d/guvagafurixi.pdf
    • http://bnblspecialities.com/userfiles/files/13806467214.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/408630cb0342c0825cfcfe28a84fad61/majozajukabidekalisotebi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=theme+and+variation+form
    • 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_off0000ed92.bin
04236a5adfeb7cfa6c047256ccb9f8cb201d654de3f71c65cbee0a74392450bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 17456 bytes
font_01_sfnt_off00011afa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFA 16792 bytes
font_02_sfnt_off00013311.bin
91b46c84af6e36f0ffef3f1cfae9969ebb11afe258c5add33a962b6f3fe53313
pdf-font-stream PDF embedded font (sfnt) at offset 0x13311 10432 bytes