Malicious PDF — malware analysis report

Static analysis result for SHA-256 0361c1f928ca1fd0…

MALICIOUS

PDF

98.6 KB Created: 2021-06-27 05:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5689fcd8b7e5e823ad552de9bda588f9 SHA-1: 48a09d976380915fe1a6ec8dadac1bfa9eeec8a0 SHA-256: 0361c1f928ca1fd0c3fd7047025e1ef9c3937934bca4dc479d904b00f53732be
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://classicalgardenornaments.com/uplds/file/gulimuxalen.pdf In PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/tnk0kn4qnoabgirrikaftrlkgf/boratikinajefanuw.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/64126161646.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ospvg90a2o8nb4r09ccjaf15t1/zafirorinavotebesow.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/617e65tjf7ahesmou1ces596qe/84617749373.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/0jtu40oqcjh1r55gfcnurpa5b1/kigulaxabofupemuliripoxew.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a365c7a933d---18808584008.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/57bdb36be4f3df86c11bbd76e4ae6bcc/21847093642.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/nalatarezeki.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/dm59j61hg620tcochldkvt4ujt/36592489821.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088261a03f2a---wivotevarowod.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/vobubimamu.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a794cfa07---vewupefanazuzebujodutiwuw.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/5321640498.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0d807b3a6---tadoxesulo.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4d9175303---85858306992.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607268e494a81---wajafepuxevopuwunij.pdfIn PDF document text
    • https://arerp.kr/data/file///wumirufajazefo.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3ee7cd2ae---9628288566.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/3865bc524941a9af6c218952d396c9a5/volojilojebidofake.pdfIn PDF document text
    • http://www.celso.org/download/63641011904.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f5338b5f3b1daee110cbf0559daabedd/45132782867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=one+sided+love+quotes+in+englishPDF 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

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
stream_005_off00014ebc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14EBC 24780 bytes
SHA-256: b596c3806b3c9266421b42c8f2d665fc60623189fa4af748f40f0e87f249723b
font_00_sfnt_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 17492 bytes
SHA-256: 2195fec708aacf1db16facd539327e3ca45ac3d6756661fe50eb18d6bfe1ba16
font_02_sfnt_off00013710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13710 10604 bytes
SHA-256: d54dfceaee5785366a081a3565a535e9ad94460cd56351e672d00801c24c94ba

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