Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53582583439caca…

MALICIOUS

PDF

116.3 KB Created: 2021-06-27 22:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 230a4a74573c4378b34920646add8152 SHA-1: a33e3294ac62cf06614a3de2b906855512eb86bf SHA-256: e53582583439caca6c935de9038be6ce3ee10fcac993155eff34095aa593b3bf
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs point to potentially malicious PDF files hosted on these compromised sites.

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 http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d6365e5b8---2485597783.pdf In PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/19502586e7149c516e9f660a6ea577e2/91362544383.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a3f8e54d3---76292316552.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/zuwaxut.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/musikugikufube.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/40679f546e7c92fe16809ed0fa81a700/64538585302.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/88116219812.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/68262767058.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/datemoxapufotizapuwoj.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/xutaxituxopomusidavizav.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210612_211224_8105.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a47b28dc---guxipuv.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b699b6dd2e---78204610871.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4403c0df86---fagukuxusuvaw.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/gibogepijuzowovoso.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/85655676146.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/11c9832271a4fe022c4875fad75654cd/52769768412.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a982c4072b---fedowejoxofare.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24b743ce40---36044364869.pdfIn PDF document text
    • http://soles2walk.cz/data/file/32692906280.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/b62cba6185e035c135f63ec84f794a87/voxulap.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713fbb9e4fd---pofipikoxuwus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=domestic+manners+of+the+americansPDF 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_off000166cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166CF 10556 bytes
SHA-256: ed1c896623811414a7aa1e73bcb5519cb8124edc62f77fd071388aa5ac89d8d1
font_01_sfnt_off00017eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000196c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196C1 17540 bytes
SHA-256: 47bfe5c935c001c7112996412f24c584e0f7b4b6f52906393c34ffe36dfddab8

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