Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d4b03cd098b0c1…

MALICIOUS

PDF

89.7 KB Created: 2021-06-27 00:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75f0dee5da80ae93a8f3014820d031ac SHA-1: 7d612b00e1fef5db845b4239136a841dc09d62da SHA-256: a2d4b03cd098b0c12c50968836253172b43ceead80e4428c92558d8e7a97a3e4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=crossy+road+online+multiplayer
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/qlnh12bgn4getqck7pchiap8h2/jexenevutowidelosudud.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e18878f875---pilefefanavapa.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607057448d86e---xululijuwiti.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/2858c249b9adf96a0c1ee1899c0b982c/23436672696.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609ead7e6ebd0---tekap.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160964a1432425---97771387730.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/roljf2h8ik5pmkdckl24rdtepi/17444458713.pdf
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/65598129658.pdf
    • http://njuhome.pl/ckfinder/userfiles/files/nubokonekovow.pdf
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/91986234465.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092803c20010---karunovir.pdf
    • http://podiummoda.ru/userfiles/file/65555227579.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/677073d4748190477c2846df20cace5e/jataberobutageveve.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/a701ea5dba38da308b5d267d3bddfe06/773702842.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/qd39apr6fnqorlo5dbt6hrma77/21947869950.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5e212b5a9b32d23182a9384a58c746ed/rejuviremepaj.pdf
    • https://skyzoan.com/cake/beta/userfiles/file/lopaposevuzonu.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609619cd13b66---petavenopezo.pdf
    • https://daaeportrett.no/upload/file/21677332851.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/3409c8d1b90a6ff57c2167ab10cbca37/23768060335.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-24/20210524010306304519.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/e3aac3d8acf4ca54bad9bf91a608fcbc/pukezemixusujibiduxe.pdf
    • 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_off0000fa8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8E 16792 bytes
font_01_sfnt_off000112a0.bin
d9882068cb5a89f2930cd32cc32d6b9408dd8ed2cc3dcce5be6b4f7e5b826b24
pdf-font-stream PDF embedded font (sfnt) at offset 0x112A0 17792 bytes
font_02_sfnt_off000140e0.bin
212c7063e36f81caeba11562edfd2357c6d9510c154a92e0191a9554e9185a62
pdf-font-stream PDF embedded font (sfnt) at offset 0x140E0 10796 bytes