Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7753550f585c62…

MALICIOUS

PDF

103.3 KB Created: 2021-06-27 23:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: e51e95af17954b4a76fc248cd3c0379d SHA-1: bbe5f83650ae6f750bbfe2dda06aa8476610f34e SHA-256: 6f7753550f585c62502f646310b328510e68c2b14ec7d0ac895893e8c398ce6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=jumbled+words+with+answers+in+tamil PDF link annotation
    • http://aftckwt.com/uploads/file/sarowunekuv.pdfIn PDF document text
    • https://strechybenesov.cz/content/vopowagiladado.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/begefikakivilenawid.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/48cqksga96idgkq346gqed2tp4/gesoforukebebel.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/9cf6a14f626dc261efb3a2dc808e7c49/gobisepogosenuvuzi.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/r2cev4mv3gvn3tu9qldn6gmie5/menitorilotor.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f0297c873---geregapomezodisetib.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867f98735c6---zawibap.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/vusuwu.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/gutukaxirukukunavof.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/9pupng81kv3un85gbb2b7ms0v2/46055498772.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078de46babd9---bunupopadizujera.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b45861db7---lexomuvuwuvawuxasul.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/25534337058.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0523ae948---jedixitoganibazokojojuvem.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/pv3hhii9n706p6q7k3sbd9sh0f/12819066688.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/39c8862add9ae85fccc82c3acd21a38a/mufupagujabiwat.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/wotugapewikunik.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/49945cd6930b2aee8af8d873fd0ece8a/zuzopa.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4faba9df7f---51074419538.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11721 16888 bytes
SHA-256: ce2cf941c41507321d374733769caa4ed0cfddc9d57642b4ffe4eb692096d3f2
font_01_sfnt_off00012f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F97 18460 bytes
SHA-256: 7df017416fcc7e41eb039abae35cee1baee3d6e74380c7eda9cf173fa54e54df
font_02_sfnt_off00015ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ED1 10832 bytes
SHA-256: 33c1e4ee800a28e665d3fa13c480775f61a3f657259f3c85b3feb4109c02044f
font_03_sfnt_off000177a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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