Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85f8d6a9d9e1406…

MALICIOUS

PDF

93.8 KB Created: 2021-06-29 04:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 30a0da57f79f62d3a0204ec59256ff86 SHA-1: 5ddfdb1dbc029a61469e5b88c4d36ff1a9c22a38 SHA-256: f85f8d6a9d9e14067db92b7693590ae3a2f9bf2225e2a2a3807a1314621c2ec0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. ClamAV detection and ML classification strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with phishing or SEO-based malicious redirection campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609052577bbb3---89622424734.pdf In PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/55b2a21cc3c174d0e122fcee60111f09/5984452284.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/83337001345.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/80523762206.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/9deba6034875b3ccd5fdefeba4f731bf/70381565928.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f821soedbm2dhe7r7oo2j79r15/65170178218.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4fde72afc---boxabobu.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/9ee7700b8f03c1f8920ce4412466a9cd/77984756438.pdfIn PDF document text
    • http://tipiland.net/upload/file/vunudadatut.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/kedopokizugeb.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/zutuvogubef.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/31724766041.pdfIn PDF document text
    • https://ivanamihic.com//files/wupinipof.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5229a6d67---rosemufexekutibiw.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/bukewaturum.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/6fe92653777c37490ee90b7f16e2f5bf/tobuxukazijibos.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/s9dh450p0ut721the64ggte444/7472182187.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b4ec21769abea0b23f71c1ec56763ef4/fururisaforotimowi.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/37779695978.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/zenixetivakezarinojag.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609afe44ee64b---nuzuwapobubamuzir.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608861b89b824---52987166888.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb3c3ee80f---mebakusuxitalanu.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/e5b73ff6c9f0c852c035171eda62441c/77906519438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=visionary+in+different+languagesPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f6a3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF6A3 19008 bytes
SHA-256: 560cc0a8ab1a56937b62c9f6e625ecb1af682811ed6e485a8ae326bfb8cfb1d4
font_00_sfnt_off0000cecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 4244 bytes
SHA-256: 51a54aeabc0220161aede859cbb411ab19412e12b90554da4bed4e00bfe88ee1
font_03_sfnt_off00011658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11658 10712 bytes
SHA-256: 9cc17e7c0732d1b49843ab6804c55c4763e799554f09da56c0d5ea898b836180
font_04_sfnt_off00012eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEA 23024 bytes
SHA-256: b774c6e394e2f23938c352c17f9fe60cf9a6cd199ae59fcada8d35ef2f43e3e1

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