Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ca93984a485c2b…

MALICIOUS

PDF

83.9 KB Created: 2021-07-15 17:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72cace5be7bb5ff0a91d68501bd728f2 SHA-1: 8935c80a2d7d7dd0f9216d443b3a3f1c8917db38 SHA-256: b0ca93984a485c2b2da1c32c9ea36d1f4dc4db60c75f3f21e21987f17db75392
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple external URIs and link farms hosted on compromised or disposable domains suggests a phishing or malware distribution scheme. The document's structure and embedded URLs point towards an attempt to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://allytemp.ru/uplcv?utm_term=slope+of+the+plot+between+pv+and+p+at+constant+temperature+is
    • http://paradisoseminatrici.it/userfiles/files/97256976737.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/f6db40c8ccdd048e4fb422913a85176b/xefakijusidu.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/aa79bb449d264aa59b5ba123a5b468ef/ruwoxufogovetuzojokeku.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/a3burtrdnd97mq20lj073augtf/84041866795.pdf
    • http://ikkosushi.com/uploads/files/todijajog.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/bbpb6itbcfb37imo2cld6si5ta/xomep.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a72cc07673b---43866992864.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083600982a71---96998116109.pdf
    • http://ahchala.com/img/file/99098985341.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b4beec7bd---pitirezo.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/nk2eg6qvsij8onedll0vs3c7i2of8d1s/69023531486.pdf
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/gexajawus.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/49423463545.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc9692e2d---16048058028.pdf
    • https://grupo-kayros.com/userfiles/file/91930004233.pdf
    • http://jtylek.pl/Upload/file/15431730656.pdf
    • http://hncastlecable.com/d/files/76408696415.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9adb174f95---97495839277.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c69c1e32239029ef49d298dce7434dc6/33060438285.pdf
    • http://thienlongadv.com/upload/files/93636376491.pdf
    • https://reitinguok.lt/userfiles/file/99931453164.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_off0000e535.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 16792 bytes
font_01_sfnt_off0000fd4c.bin
4bb60ed25dd43fa8ed484e78a21e978e38888a7679f7143265ede1ba76640cdf
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4C 11352 bytes
font_02_sfnt_off0001179c.bin
f96e48b308e4ba42d870627b87d3b7041e8566c0ad20f72b544cada9024ffd82
pdf-font-stream PDF embedded font (sfnt) at offset 0x1179C 16296 bytes