Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62f7d12055c9eeb…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 20:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e09b11143b4adb4e95a7e976bf5da008 SHA-1: a42bc04f9d45ee9461fd626469f3455f98c53e3f SHA-256: b62f7d12055c9eebc8f1e887526e4fae31cfbf4df8d0ef7c33d48064d3d80048
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=tally+marks+data+worksheets PDF link annotation
    • http://macautemple.com/userfiles/file/rujixujibav.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/f5be296effa9961c4102369216d7e883/gumisam.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/zugexopedub.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/xaberefexapujifinasile.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/83209952577.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1612d19c746f9f---kogakekesakubefad.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/64711932815.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/tamuwotagiz.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/njs9554gh6smg586t9nnsfj403/67321828005.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cda22854b---19499470644.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/584d8ba58970a99c95fc88a77ccb07c0/vilelowe.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f917ace99e---gesidil.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0388fd432c---legebamadetawufufinifos.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fae25a6c1ed---21138922432.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/wuduvigem.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/72344575506.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1a32e35b410fbdf2995c35606efb241f/guzedokif.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1623696564rudinizedas.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/28244643208.pdfIn PDF document text
    • http://robedecreateur.com/img/files/97266218656.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/navowasunoweruma.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce872dc654---58434142294.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863a37ad116---taxefewasimobagana.pdfIn PDF document text
    • https://0900107678.com/upload/file/90207323729.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_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 10572 bytes
SHA-256: 565fa3aaa9dbcd5222a147fb54aea3fe225a6ee318429f5a0e51aff9ecddcfa8
font_01_sfnt_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10933 17284 bytes
SHA-256: 52835930e4557e07daaca9fc24e554b1b18edd10ce0bd5aec5171610bbdd157d

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