Malicious PDF — malware analysis report

Static analysis result for SHA-256 0808b6b571ae5b57…

MALICIOUS

PDF

87.5 KB Created: 2021-09-02 12:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 67617fdfaa13f4314c4d7a5361fa00b2 SHA-1: 98be5eaad7b665e5afad1647adfad19381610790 SHA-256: 0808b6b571ae5b573504294e0c997ae836d3d5729a92a9b8a62c8d269caff2c9
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised CMS uploads. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and the link farm structure strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=foreign+direct+investment+in+rwanda+pdf PDF link annotation
    • http://automozg.by/upload/editor/files/21372978005.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7d791fdb54b4fa7c810e2f495653deb5/41031683974.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/32355978659.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160927af6e6a74---lujok.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0692e4da---ruxoka.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/jixutugoloxeget.pdfIn PDF document text
    • https://pharmalogindia.in/ckfinder/userfiles/files/24050733982.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/25698674090.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/wopuniwumijanegaduvik.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2087e15d5---85450421070.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/07bdae06af5f36e455c33ed43bd53dc9/48141735123.pdfIn PDF document text
    • http://jarosi.hu/files/file/12107276420.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/aebb16565c31f6db3d6f35c86bcddc56/22395985394.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/turukorebekilev.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098e551e17b6---bobokibiwilinazazupuza.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98f89d9f08---93829879056.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/cb64d091b367bfdd3e5872e990666188/fexaximavobiluzujana.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/13608116894.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/71460366285.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/bazijoguvawuruwexi.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202108141326014508.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/190894163560c1bcbc32887.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/zolevakefexulematogugoval.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/62285142870.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_off0000f06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06B 11044 bytes
SHA-256: e3b3c2d15d76e43cd43d3ce2ccd6569e48e2192e05a8dee8f1cfc43ca1774426
font_01_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12213 17648 bytes
SHA-256: e46c2c48154720ef3745372efbed96c69eb048b33d4f8d5e581deb350c60fb85

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