Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35ea837ebd605a1…

MALICIOUS

PDF

97.0 KB Created: 2021-08-04 19:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1fa33ca14f852dae24ad4b4decfeaa89 SHA-1: 93b41e3571e5c1ef5cdafb9f7ab0968602fc20b5 SHA-256: c35ea837ebd605a1a67ccc2179e94cc934bb164ba2d9644ff5c9b8fa47873219
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

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 https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/1c23914cac52e29719ac2a849ec2f80d/gosibofebubad.pdf In PDF document text
    • https://pasarantogeldua.com/contents//files/sebugatinuneroleti.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/bf11d17cc5b289a5906de0886afe5da0/jodigunelobipizamuvu.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608042edc92af---72637696590.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/9f6dc591c10975362d628c9626d7aa23/luzotixewomelowat.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841567b98bd---woluterudoga.pdfIn PDF document text
    • https://red-adlay.com/upload/files/27437002547.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/35471584363.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/mutolu.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/fejusafesibogujosuvel.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/p68bfud0u8tuqk84m36fqsncj7/gesamemusuvavidixa.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/fjt7jh93ktsnpk4ujvk93b4epa/nuzewegukupu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160887bb355f50---78170520108.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/suwefikijem.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/vizetipumodaxexa.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094453e109ac---48760074485.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/fixupunidora.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/vaxoturijexoxud.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/50183219938.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/17396149080.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73b53c791b---fozomajojifilegixel.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/nd4c88kmd416kgqkghso2h9o5s/64885221918.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b568c33b095---73838947285.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a66602b54c4---senubamobegetifafonukat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=best+frozen+drinks+at+dunkinPDF 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
font_00_sfnt_off0000fdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFB 17972 bytes
SHA-256: dd389330e4aeae546759c0aa413d545c70d5440ade58e234f9134c906dcbbf36
font_01_sfnt_off00012d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D32 10608 bytes
SHA-256: 521ee96c45a9ae3915ec3e67cbe0e611c755538d2b4361c1ecf784bdf449443a
font_02_sfnt_off000145ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DBC 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae