Malicious PDF — malware analysis report

Static analysis result for SHA-256 106d6787bd3eecf3…

MALICIOUS

PDF

88.0 KB Created: 2021-06-30 11:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a919add8c5cc06f9820d90a1c254d449 SHA-1: 8c96784e75b153f9fa14c70a7c26615b0c3a91c3 SHA-256: 106d6787bd3eecf3d0072b2007c409b578db2d76f9ffae50b5440d0711cf4173
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coluer.ir/documents/file/durakajena.pdf In PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fff8073d3---zexowivomeleralupakisegab.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/85406207003.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/pizokibumeviwokori.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/pufipo.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4b64793fe1d7b31731e712a31bc8ab44/sugasuvebeborikigazifewe.pdfIn PDF document text
    • http://chikatere.com/Upload/files/84027898738.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6e25a3eb0891bdf109c3830f4e969fff/zedaxuvusizodevij.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608591ad17f12---rotujodasibexeli.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/negetuwap.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0cf695f36---3312449954.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/aodjfu0rlm2ltcqd0lf0pj8ov2/zegagikejukisuvag.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/9femevtd88ah91jt0c40c2icp5/58616924950.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160810ea077ac9---11974616774.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021062112243697.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c288a954302---gujunidowugosavapatot.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/rifirevamudigarunijevirer.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/2532423459.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/xapelezonirilolunodozenu.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ck6iggk4fmfkohstq5nli27psj/69648476138.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/25991473589.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/gatumudobof.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d9b3b6a47---nodakipikizus.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/92pv71ka4flg8pir15lb5ofs1m/xurazizutajemaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=password+protected+pdf+to+excel+converter+online+freePDF 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_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 10868 bytes
SHA-256: 9a1dec032f854472f0916884f7f6b5cb2d3ec756c35bc9ad50f7ecf91e8899d9
font_01_sfnt_off00010d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12567 17180 bytes
SHA-256: addf39f1bffd7aa3337edd36688006ab16f66976347d962472a1841c00ca1480