Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8d0ab7735429a6…

MALICIOUS

PDF

77.8 KB Created: 2021-08-07 00:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 721364895684aebe01cdefe8d8a0e2b2 SHA-1: 3ec9128c531fbaa763cc570544625a9c4139e3e0 SHA-256: 6c8d0ab7735429a61c85e36a37f829969f50c1c1c0f9cc0236b5fba9235f990f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to compromised WordPress upload directories and disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607443de59517---7479236185.pdf In PDF document text
    • http://smithandfriendsfamilyreunion.com/clients/d/d0/d05d9bb0b75700e7199fc64e52c62161/File/56094043909.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021060506461817.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609588a1d95a3---49594877703.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/xutozajaxuvuwegajugo.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbf86b19c4---walewurixamuwujomez.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/sabono.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/gamerudewanenataga.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/samatodipide.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/mesinavumenatusof.pdfIn PDF document text
    • https://actor-conseil.com/files/file/33799266522.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/nupototasumojakuvubu.pdfIn PDF document text
    • http://dothi.info/images/files/puziwexetonoko.pdfIn PDF document text
    • http://sun-eko.eu/files/file/sabififaxumatalitinegabo.pdfIn PDF document text
    • http://www.celso.org/download/99312542580.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/tirazizomotutateni.pdfIn PDF document text
    • https://estoniapools.com/contents//files/rebilurujafug.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/fofufemapibekerabokeraf.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bfcd0d1be---54663416535.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/polagikedusufaponidamux.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160760cea1b05c---17492325931.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108a6b8f09ee---77041375522.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/wilemokirilujedix.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/53666463972.pdfIn PDF document text
    • http://atek-ent.com/upload/file/10778835979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=best+diy+home+security+systems+2020PDF 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_off0000cdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCB 16144 bytes
SHA-256: e6cd8399ac9e8289a62c373268b7a3011c93bcf1ec3c747d45b5d27cb2578115
font_01_sfnt_off0000f74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 10832 bytes
SHA-256: c731971fa13f6d17f98e8bab47bb60ba56cf29d93410b7e88767f1cc172cc8e5
font_02_sfnt_off00011070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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