Malicious PDF — malware analysis report

Static analysis result for SHA-256 590adbbcae018b15…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 09:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 164d780b583dcf6e8a7ad42a2f8352f6 SHA-1: 77fabeeaf1f9bdd7f72b857e3427f19a5457dc43 SHA-256: 590adbbcae018b15d94cc831a982b2f0ddc0e355beea8ab69f58b9b8f5d55313
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using PDFs to host links to potentially malicious external sites. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://drafthe.ru/uplcv?utm_term=chrome+os+exe+installer PDF link annotation
    • http://anninh247.info/upload/files/96272323916.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210906_060745.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/45154482329.pdfIn PDF document text
    • http://protezas.lt/i/File/bopeguwetukuvopakidid.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/garipumoxa.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/qqfl8rnim8648sgdvofua0fghc/89626360980.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/mumesetusedef.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/85816262591.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/vubenaro.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a07ebe60b---36488300511.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/kukugupapit.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/nekejilurefokizafoloze.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/rujagevufinabezejedo.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/30300493362.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/83506955142.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/41779639375.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163147397293928276529.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/telenobanivuwivorab.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/sogutenemewetuviraliwu.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/pavakodevovexexudafok.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9b886dde555f7835df787d22c68855b6/koriwebogopekamofamoporin.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/tabin.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210904062716_4u9904.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/89015500324.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/nufenixowiwisegati.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/96302044899.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 17392 bytes
SHA-256: 89987bf6e089d8e86c7c34e655b2d5c8eee3d67cea61af6d8c628ebf1f3a504a
font_02_sfnt_off00011fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC4 10504 bytes
SHA-256: b0ee444d3a59f634d65e0999b37fa8ea18c70ae3a2958492aa06fe1c893795c5

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