Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e3651d17428cd12…

MALICIOUS

PDF

89.1 KB Created: 2021-07-02 20:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: affe40150e5fdda8068f81c43642fdca SHA-1: 67dbf4bf5e283f69255d498b0dfa5efc1d248391 SHA-256: 0e3651d17428cd121f3a36be897f7b9d0b15fa5d8da9dbf2061e3807ee4f05b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5cf2613d5---sovovijubivi.pdf In PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/c4a91a77faefb806106e7631fc70d028/56537223305.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b93e9197e---81531840072.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc41771211c---96566286476.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/ccfc7f3f6813ec570f0fe60c5aac0baf/kivogabitow.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e83ef34f82---puvusawijuwavufurisovak.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/5e71c76b7eed9dab47ffb47c4136d226/mobematewozavu.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e51fe63fef---fagilunure.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/tm5t9acpb7tcbk4e5p9ufk3n39/pexikosofuwuxoxivibunivo.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/9486361181.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/pulavi.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/65887098648.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/runasuwasabipidipekemuku.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/12d0a709ada2e3990b8d7e621628fa62/56597892053.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/vemixufokonuxanijarerok.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/4qh4he01piqo8t7qnpmfegmg91/52100046276.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608732bcf0ae5---96479846218.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/52936539602.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/eb51771d8b03b4ff0529a9594fcd49a8/77614207867.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/popowix.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/buluneromititib.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/xuzanizelabenawopogote.pdfIn PDF document text
    • http://accessoriesunlimitedinc.net/catalog/file/dovuvofeguwinu.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/82952076553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+3+acres+keighleyPDF 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_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AA 17408 bytes
SHA-256: 12c94850eb1392bd5c6c9a5307046fd936107b97ffc5e486bbbf06fd38385074
font_02_sfnt_off00013f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F08 10528 bytes
SHA-256: 51dfdf55af23e082a62aa4a9b0af9c32714baf7a0059fddf077fafebf4421c13

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