Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d577a181d4195a3…

MALICIOUS

PDF

91.5 KB Created: 2021-09-06 18:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 557af3a21cff5de49379f2b56e0cd168 SHA-1: 35cee392c8617125a1ebc3d302f6b9c775d4afc3 SHA-256: 9d577a181d4195a33d1e7f35cda3cc2a38b71387c9a23148265ac7dd9d0e4cd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=le+syst%C3%A8me+%C3%A9ducatif+fran%C3%A7ais+et+son+administration+pdf PDF link annotation
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2007638ed---bibewelajamesilefodewezis.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/9rraerg8eu7738vj0vd2gbm8l1/gudotonuna.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/tesijoxafovupegudinevugup.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ab7683b83d309865ebc96e47bc4dfed5/wegutuvogulexebafebe.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/jq35p8advenn1t4sj2j9od8bug/tozodusutevana.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/54164831904.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607515c02e14c---52590897689.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160779ad984b4c---soxiworegaledeto.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/jevenuguvaxakimodagigero.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/giset.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/9c25a077a927c68b6a424fa92fbf1b28/giwutedob.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160946ebe6814a---zijepaxejexomusoke.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079471284c29---99759168475.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/83092845306.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/lukesutibupukitovafifi.pdfIn PDF document text
    • http://nanopena.cz/upload/file/11112505740.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/16145350873.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/0d4qs0at5669rngeir6b13s1aq/porerosiki.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/42b24586e4379ba8bebda1a2d7ca24d9/papozeso.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/69699839387.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c878d95b35c---lobidapitonowagafusutaro.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/923b480b551dd801884378a27e034dd0/josafukilegobomewibap.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_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F9 11412 bytes
SHA-256: b8e6af3ae358fe57dcff0679fdebcd9f3ecb12383b7b5d002bfef7226ec9c798
font_02_sfnt_off00012ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE5 20424 bytes
SHA-256: c6141327049b0bff25547654217a7560e0b7b8f41395dffd87a55fb102c6c12a

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