Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e6715bb8d52c36…

MALICIOUS

PDF

75.5 KB Created: 2021-09-01 07:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c0d3f997711fcdb00511fd00161d9bab SHA-1: 4003a93e2ff89dab195f1404d151b74ed0554c6e SHA-256: 25e6715bb8d52c36c13bc35fe223994a6e8cbb199c6e2bf2ce0b66da82d24ad2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of link farms designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The presence of link farms and compromised CMS uploads suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://mashtalkandil.com/userfiles/file/33197413445.pdf In PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/tovetowuperoremoware.pdfIn PDF document text
    • http://101balkon.ru/upload/files/tamun.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608808aa431ac---mokufa.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833761009d6---lapexejivimorirolanubet.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/180d4fc4d6dbdf378953a7e5635fb521/danadi.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096341573cbf---lexilajomijinij.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098361e37aef---zozezurivezomid.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021060900073424.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/r56fc25rae09mr08uv01hjin2r/78416871624.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/b24b1b3a42fdf792dbda1078a8a500c9/41798902045.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/xebirororexav.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2ea0ba8a06de1da7058a1c994e102a5e/93370602659.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fc189cbcd---papirolematutafokibosoril.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/8c65e92bcc1c552ad1b9b73cc292120d/48188189494.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/fubuxugixesasitutoxeti.pdfIn PDF document text
    • http://dentherapia.hu/files/file/dugijataxabikasokesewo.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/49835022096.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/19837b96a2e082116f28636112f9c5b7/62178058554.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/39079436670.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/49558865187.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/14172569628.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/no5sfsgam6d5dlqao3jl5lbft1/97643385800.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160935103719fc---88910227679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mary+matalin+carvillePDF link annotation
    • 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_off0000c2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2EE 17812 bytes
SHA-256: 53612f4570090f4bd593143b099a243082405f1be042cfa051bd82731943b064
font_01_sfnt_off0000f0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CE 10276 bytes
SHA-256: 41ac4ac6a745badfc92fcb46f583db6853a585d53ca1c0f7af552e491765f444

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