Malicious PDF — malware analysis report

Static analysis result for SHA-256 961036035f100f5e…

MALICIOUS

PDF

77.5 KB Created: 2021-09-05 05:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e93fa69059b3831d8d2369ba422ec07 SHA-1: 0da6d8ccdde95ee42260c5ad5b48cc06cf844388 SHA-256: 961036035f100f5ebc1134a8e2115c7e4215694a84dd7210bf11cfd01b32b992
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The document body is heavily obfuscated and unreadable, but the overall structure and URL patterns indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://irlanc.ru/uplcv?utm_term=taylormade+m5+driver+manual PDF link annotation
    • https://foundryindia.org/userfiles/file/69292654150.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608693a1627f7---lovitumujuk.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/zozuvi.pdfIn PDF document text
    • https://castel.ro/userfiles/file/92568173041.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/92197290522.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/vujubararilasasosuwazi.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612719095c920---75375140064.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/85226594892.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/rolomamojamovuleroxa.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/fumokopogogipudepud.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/4e0def797c94846781e31ba47887b811/fuzudemegajijekofurapure.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/80886652925.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/17127033814.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/54230221652.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/42617031929.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a705158a5e8---88377235200.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/40882571533.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1622045496.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/bekadakebegifemo.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/ce49f1cb4633ed3b2cb2f71a5a2ae9e7/22361197704.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202173035555743.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/506mnpknkup38jeinnvoaoutfg/febajedidif.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/24498986995.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_off0000c95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95E 10520 bytes
SHA-256: 43924018e837c31b33c36ca14b209abb99fdc9dbfbade1be8b9fc609d29b90dd
font_01_sfnt_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 17892 bytes
SHA-256: 661f9d92cbfa081886b452ed6839f2dc54d038c6f0fb2faec45d92b249e284a9
font_02_sfnt_off00011095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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