Malicious PDF — malware analysis report

Static analysis result for SHA-256 f020575dd739d9ed…

MALICIOUS

PDF

87.5 KB Created: 2021-09-01 12:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 42bc58b70a3a2b68b4c54eeb166db435 SHA-1: b602516c01e1a2be39b2c18468c0bc6f8a2e299a SHA-256: f020575dd739d9edd3a6da960cfec233fa1cdd03e98db5f3705f5aa7e0a755bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of links, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://clinicamanila.com/ckfinder/userfiles/files/napemudusipedesotix.pdf In PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16080223b93c67---tagujevemavepamige.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/gemudezezobolomofegit.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56b50378c6---19837274077.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/93261276629.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/91095064607.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b60ef95b1e---pokabowariralu.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/d36a084dc16dcabfb52b3108b64a2acd/gutumu.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/kiramofikagex.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/96607748735.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1611d4be1c469b---23667593776.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/zefuwadonajevetanukum.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/37aedkgn98n60ijrgsp67invh7/70862419847.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/38708135143.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/89115924190.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/32554030750.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/wovurikifo.pdfIn PDF document text
    • https://eternalbliss.net/file/95503231382.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831976d4dff---takuropitemomobavovawenud.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/r571drqnj8h0o4lhg7d6ae50vu/ralapiwurusoxez.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/30630661851.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/timoxafabudadefinetalok.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a553eb265113f8735c8c52bd785f2eae/14758613882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hovercraft+on+roadPDF link annotation
    • 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_off0000f0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 18800 bytes
SHA-256: fab4e38a1616151339f7cd740a6c70b3344964dc2543d99ca44d8a37fa1ea569
font_01_sfnt_off0001215a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215A 10220 bytes
SHA-256: 69bdaf010d16c00221fe549c5cec85ac5ec03f03da6df9ce1d525f236d35fcba
font_02_sfnt_off00013863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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