Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a2823b3fe8e241…

MALICIOUS

PDF

97.2 KB Created: 2021-06-28 23:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0359a5d46bc9ef1b342e79b8d4d45c07 SHA-1: 5fbce9912e0576e297f497a91f19dae4a9a5080e SHA-256: 26a2823b3fe8e241ab7c5251adaea803f8924ff8b47f3d04acf0304112a0523f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to other PDF files hosted on compromised WordPress sites. These linked PDFs are likely designed to further phish for information or deliver additional malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160aa224960e2b---96094899096.pdf In PDF document text
    • http://coiffurenais.com/userfiles/file/16282477824.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/f2mtt6saufln9635aeju23uopd/fasanuzofex.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7e5dcbc32---siwabusojuzigogojawereb.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/53423253263.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/53mpjeuc1b95tmllvm338t5t9o/69832534379.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc2f8f6619c6453d74152cdbf9e79af6/nafunejoxi.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/cc4aee17e239fa883c64a65fda5eb01c/36000009843.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f844ee63d9---zepuzigoxakotu.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742b37de302---98562145730.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a47dff4d157---15684600354.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/vopop1cgvu2voof31m7l3eroi4/74458046817.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160879ec11245f---72554101841.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/80811197339.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f48a6baec5---81218796907.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/75907300165.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fc4a8beae---55122621491.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/2336c84c209dae16692d9670be991bf0/20886177616.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec93f47eab---puwutapusesimatimawotegim.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/5c3a769ea12a4bc043c4e05fbd33b647/vusedulevamuke.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/571bdd9e0d9ebe99cabf54a2fedbdb27/sirurunabofav.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/cbd8e7d161697b188f3bc50494494a0d/57298667508.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/8501998966.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f493286c---38563060799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ldr+opm+songsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001287e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1287E 19152 bytes
SHA-256: 40401058ae4b506b1e16eb8671dc17f2d3fe7897f60af2e450e496ddc06bd03d
font_00_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 17660 bytes
SHA-256: 0cabfdf73cafd01d63ea2bd341dc112bbb31f8b016773876766b84631e3173ad
font_02_sfnt_off0001477a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477A 10160 bytes
SHA-256: 56a03e26d322438bf19e7dd3e869b4873262b432e4055e1d9847d414bba32931
font_03_sfnt_off00015dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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