Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fc5e8a170b2436…

MALICIOUS

PDF

103.5 KB Created: 2021-09-04 00:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b84428c41ac5b218b7cf54e0f98d3289 SHA-1: ea68d02415531a64c3542a8d7169cc74bbe3e323 SHA-256: a6fc5e8a170b2436f76695007ad09f600bf8b669d24fba865811a323b098f0ae
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly suggest this is a link farm designed to lure victims to malicious content. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://garglob.ru/uplcv?utm_term=medical+image+processing+using+python+pdf PDF link annotation
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073bc6c8029b---8639197920.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ec8bfddb9c---10821781817.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/675c64889be69ef30d7c0cfb38841172/41472606595.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/38e9a0dd82fb53a0076f36025cc67ea4/53024848552.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/bazofusarifufirizajafaj.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/58728822235.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943d0e46926---feriginejexumajalas.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/611d3d5acb459.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607e663c6e459---kotoxiwikedunoxa.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/guvidukavuwi.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/jolirubixujijax.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/sovosujuxe.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/90447365606.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/vijoj.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/54299716604.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/46707120030.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/43d7201ba803d97565b8f2be6a604dee/vetudizamukasaminalunelob.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/160a2b2f0d9c3022cb156f067f50ce12/vukaga.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/25838584929.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/wofaxuxedezuxenizarivi.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/43825406576.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/59349100552.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/74063998906.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/49668432281.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/c3202cc63a759cfd14302022802340a5/kigasulowasomeg.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/53558812358.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_off00012cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCE 18972 bytes
SHA-256: f0c9e4e0ad45e7536ca8d29cfd0e42add3dc775c79f00510d292a01253a3fd37
font_01_sfnt_off00015dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000175d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175D3 11272 bytes
SHA-256: fb0dddbaed2446f0249999d13c6e1dd3b6fd6a54c9252fb1d187c11d2ede84c2

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