Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5984f2cd0bba8b…

MALICIOUS

PDF

86.0 KB Created: 2021-07-24 09:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e69f1bfb89c5a33f7b30861aae961fad SHA-1: 7c9b7bc06bf3fc45ec33a8cc076fb03f87e22f82 SHA-256: 3a5984f2cd0bba8b5e0b08d67e4933afd40987b335684bcc761012c1799ea4d1
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, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a link farm on compromised CMS uploads is a common tactic for hosting malicious files or redirecting users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c42fc110a87---85779527926.pdf In PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/wakivupizot.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/357042e5b4cbce6b1106ecc5116c31f4/zezolivoriwokig.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/77462148165.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/86fa79bf3ebc5df0ad6e1defe78b3954/wopotilavetun.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abd4ea0623---lofujijotumisiloli.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/sukaguxofuz.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-21/20210621031739488731.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/9bf0349f109ece91f10bebea0d5b35ed/5732441687.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3bb775431---mebedexotavelibubanig.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/fodemikuximinevutadob.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/lakavanofipadutugusa.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/47754369989.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/4the9jlje2tnq7mhe0b4llmftl/29132723877.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d26d019f9---debiwudemegifuzazupevul.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/96614186496.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/donuvatujenizenivarigemis.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607618f932c35---24759811591.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/besisa.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/16261837751433689521.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/63777688716.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/dawuzuj.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/91f95c211d5dcba942639bd433e592b0/dudiroma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+use+kanai%27s+cube+ps4PDF 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_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 17064 bytes
SHA-256: b8abb2a85eeaaba341abb8a600dab8206358e205ee2db4d6b241046971c03520
font_01_sfnt_off0001199e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B5 10744 bytes
SHA-256: 7d5aa69e0c2382234007faf8f1b7a8298ca4edf28c3ec44142b684291064a4d0

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