Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be940a65ccb85c1…

MALICIOUS

PDF

97.0 KB Created: 2021-06-26 09:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f076bb5440120f0ac4b751c15244189 SHA-1: 5b40f5b68299cf2a46a78fc0b0244f3685c26b20 SHA-256: 2be940a65ccb85c171462e04a81285c7c5aab7a9c8479fce92b49b3e661784e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely serves to redirect the user to these external links, which could be used for phishing or SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/48622281910.pdf
    • https://barrierball.cl/ckfinder/userfiles/files/18173749902.pdf
    • http://artospace.com/pics/file/71046868588.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf4b7c0ac1---63776355956.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/4bogn98hf58pndv5krpodqv369/biwafawexasiraponasano.pdf
    • http://say-international.eu/userfiles/file/tosubibufuropawal.pdf
    • http://www.allatpatikapecs.hu/images/file/nukaxikifebenuvupakisor.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab26183b67---tilivobobekipezalex.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160817aab9f72f---94278293713.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/19996d803d02290713290bf820bbe5cd/65250725591.pdf
    • https://annjulieskarpmo.com/userfiles/file/safezobepovenogaseforegal.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/jmabnaprrfvhpr6c15r29qt5b9/32787071566.pdf
    • https://ivaco.it/file/vegovagesorib.pdf
    • http://starwindows.ie/ckfinder/userfiles/files/pedegidebijefamujavo.pdf
    • http://sushibelovo.ru/files/zesafipuzelomokudu.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f059a8d75---22959164469.pdf
    • http://theonejsc.com/userfiles/file/74552020651.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/4c00498a4f64add8f8313a7f51531895/kamob.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/vonuwijugiwutijilakinoxu.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cecc81524---sifabodiparupibivoxobadu.pdf
    • https://sfasg.jp/js/ckfinder/userfiles/files/71925898870.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=nursing+interview+questions+and+answers+conflict+resolution
    • 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_off0001156b.bin
b20267b5e3661884fe9f3b2353a81290406217d1f932e8754dbfc9c3ad3693b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1156B 18172 bytes
font_01_sfnt_off0001450c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1450C 16792 bytes
font_02_sfnt_off00015d23.bin
7f7beeedd2f1471c7ff8de95258297b1d794c3d32c073395a26f163d7a0ca963
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D23 11028 bytes