Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e406b24c0b42f6…

MALICIOUS

PDF

95.9 KB Created: 2021-09-07 12:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 98b7437989bacba40be489b8e81b97fa SHA-1: 211bad3e8271f3d4dac999b1f0210ac4e73b6079 SHA-256: b1e406b24c0b42f6fe5ba0f8c854fe0eac0dbb891ed1758727475f918d82196f
196 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism. The 'SE_CLICKFIX' heuristic indicates social engineering tactics, instructing the user to press Win+R or paste a command, which is a common method to bypass macro restrictions and execute arbitrary commands. This points to an attack pattern involving user interaction to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://infrive.ru/uplcv?utm_term=service+manual+prodesk+400+g4 PDF link annotation
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160edfb721b747---resojisonarifubukawimadi.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/9f4b22e9cbd1b8a2ec8b18a58ee7c056/75627646753.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/96151035155.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2587ac85b---pikonunavipijabujitiguti.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/40130003972.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/64878361911.pdfIn PDF document text
    • http://coumert.com/images/file/wagabereduludutunemi.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/37649547388.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wupofisumon.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/89109844141.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/u061jlar8vvuhf5sghlb1i6qbn/21183349123.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090e13477bf2---18350191665.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/95902386179.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c935c043d9---pemapifanunuvafuze.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/78635328827.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ol5ls9u6j8aksqc25oho7hrv98/15415423686.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/sq5sumb0fh2u2smcjrnc34ffu4/poneliboju.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fd81189f4---75850316073.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/sabonize.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/ilkiq5o9c79b69ncf9rfbd6dvn/56081122363.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/57875584860.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/rubibarelepapepanofovegej.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e0955aa1a---wexanumole.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/buxewagupasa.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_off00011000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12812 18028 bytes
SHA-256: f9a976a79cfbfd213e4f3a517fd238278d09e7f3e42d8eb84cc6627db98b6d19
font_02_sfnt_off00015734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15734 11292 bytes
SHA-256: cdd51c7fe44a77c7bdc4b98b85449dd2fffda3980f2dc40303ebfc2937da70b8

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