Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff370af8dea274ab…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 12:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5537f3b482736439636a3f91f0187bd1 SHA-1: 8b3d8911ecc0c06e35dd81e2aa69fbdce536bf2f SHA-256: ff370af8dea274abf54c3775e6523bad045d99aff0b09810e12ad19cea3ec84c
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage, suggesting a phishing or redirection attempt. The presence of numerous unknown URLs and the 'ML_NYX_PDF_MALICIOUS' heuristic confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://vaynhe.com/upload/files/12851560014.pdf In PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/rejaxukegawigefiba.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/rd13lrd50up733p92ecp0tehak/mixasexupawemetoritoguba.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/tukibawuzujeluje.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210911082718241.pdfIn PDF document text
    • http://ranch.pl/files/file/30453679184.pdfIn PDF document text
    • http://netflor.pl/upload/File/jojowuvegesudolad.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/dafogovenegoputugajumapa.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80360421963.pdfIn PDF document text
    • http://poorclarescork.ie/images/sexux.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d177ff20---94525233887.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aea879eb71---92458458483.pdfIn PDF document text
    • https://fivetc.net/uploads/files/rojafuxakarenisi.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/getorijiderowetiwodarig.pdfIn PDF document text
    • http://salespate.com/userfiles/file/jorewubepunupaba.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/xulunag.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/nubuv.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/63807812621.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/suzipamijoruketowut.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/dokagudagibedebobu.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/109e35e8864fc2cdd4c10e025efbeedc/xuruvadisunofuxomik.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/wegudupunaxejubu.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/6475988564.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/36454232300.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec5315e45f---kogugem.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/97e04de1720d7de0d2b2d1c2d0eef122/timosibuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=dragon+ball+z+episode+99PDF 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_off0000be1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD631 22284 bytes
SHA-256: 6d675e4061773a9bafa6da4beb79df548ba062331475966edc13b662f58dbd35
font_02_sfnt_off00010fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE9 10836 bytes
SHA-256: 4e79b648363bc98e56ec5fc7796c5eea9f26e2589f8219e67c20cece89972a18
font_03_sfnt_off0001288b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288B 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc