Malicious PDF — malware analysis report

Static analysis result for SHA-256 305275f83003d553…

MALICIOUS

PDF

97.0 KB Created: 2021-07-04 05:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 967315ba349e039d5de19a1652bff47a SHA-1: 984c21ca7b667aeb7c1f4635fa492807c693ee85 SHA-256: 305275f83003d553aedc23c8f5baba57a97c6f1be868c4a46cc8306a2f07e1a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to various external sites. Several heuristics indicate these links are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection of users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://synerhu.ru/uplcv?utm_term=learning+php+for+beginners+pdf PDF link annotation
    • http://animationcoach.com/userfiles/file/zobulo.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/58287175609.pdfIn PDF document text
    • https://diphong.com/uploads/tamugotudukokerovuj.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/icmg9tisnldltdbllr6kd9r6k3/33391981859.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078316579c03---xazobutizuzajeta.pdfIn PDF document text
    • http://magrubber.com/images_upload/files/35123051674.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4hnlku3riuvafcsdgj9j7a51o/63363553986.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1185a59400---rabafodisuful.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/tiwifofasanab.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2b62fd4791b310ed2cd9bbafb29b36a6/96725865491.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6627629e02---varetitiram.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/vezomotosavesi.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/ridexamepijokuxisalaliji.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/dt655tgtp5rco2a79httf6gog6/fututodepebigakorefiten.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc109c0ee2---womozafuj.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/41140676797.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/fometesi.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/lojenejasadibikisitiv.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/18039626406.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607932bbb40a6---pafumebuxexej.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/tnl7i6ogjcuqj4ecu0f2ehf185/lipidilolajidavurajaru.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982af87dfb3---7374196469.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/gijatumav.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c40fa97723c---puzobalizenigera.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off0001181a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181A 10732 bytes
SHA-256: 3605cc853e87e08f49c03446a1e73e2175e9d96159426630dbba6517f3f972ce
font_02_sfnt_off0001302f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14841 17620 bytes
SHA-256: 20b2fe1b4046075e870a48590eb26fb929a5d56b71dee388a7a831f1aac6fa6d

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