Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff3f309ea76622c…

MALICIOUS

PDF

104.1 KB Created: 2021-06-27 01:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d220755d10b5b6df51f118d75c65b0eb SHA-1: 5b939cbcddecedbfbe9aca99eb480ff6e7833b66 SHA-256: 6ff3f309ea76622cfbff045929d9be22963b985e9e716f627c5d2aa2e25e4792
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm or redirection mechanism to phishing or malware distribution sites. The presence of multiple distinct hosts and UTM parameters further supports this, indicating an attempt to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://pistant.ru/uplcv?utm_term=i+brought+him+to+your+disciples PDF link annotation
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831f9c392eb---jedoneso.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/zerenilukusuzufijanuvebos.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094917cb94c0---fovukefimajix.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/a6htmi4m89lgi3ss4qitmn9j2k/widumubumuzirijobupusi.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086fa8244675---67866683584.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/xonivadutenesud.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e44b6fbbc---jenikojadi.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d70a42a9119---demoraguxutoratekirejilo.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/15b01c4f000ca5f60f253207a32fca79/femurepunoronav.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/63aac909c368574d55f2475288497ba0/3907584254.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/bsmoaavkctm2smt3j31cvh5p72/56545125559.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/k0perrssuv8qoj9r7takh4m337/47464408972.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/jdg3hr6ivep5u2hq6tf34uqet6/26759303336.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/50417893662.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/01f690756c87a8dee75c648d10bcbf3e/xonasasipewoboriwe.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/7qsvlmdn6bq2ra6mppl0os9p55/wujeserepe.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/sunumakoxasugevamal.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/liloderirulaliwadolera.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/pilatikax.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/14788124574.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/8mlcauqtv1kli7utnqatkauhv5/69867675863.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02f43dde90---rexevap.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084129b9a451---kobakijobuvalamesexeje.pdfIn PDF document text
    • 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_off00013033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14845 19324 bytes
SHA-256: 4a490ebbedd080576600bea79742b3930d8cded9eb3f34cf03524bf30213c5d2
font_02_sfnt_off00017aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AED 11000 bytes
SHA-256: 2cf61d9d0c5d913b7a48870ba277b04a0410f21f2de230dad5f21d1685bdd792

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