Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcc94a9090845f7…

MALICIOUS

PDF

96.7 KB Created: 2021-08-31 08:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a3f886d966d1f087b10d1a795e85d75b SHA-1: 65a740ae8a6ab13c1546d1bb2075967902425ff1 SHA-256: 5bcc94a9090845f78651414f5289b0da3cc3c1a6a0bb5beaa815d81257278896
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to other PDF files, some hosted on compromised websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URLs confirm its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/25fqbbogu5bmf5fhanqu1e97dc/gopamobanemi.pdf In PDF document text
    • http://thedewakohchang.com/image/upload/File/adoxifobeze.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/58578307243.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/guzobunilen.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/redaridovalivizawameg.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1612961053dd40---11324127995.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/wabirin.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/97717904142.pdfIn PDF document text
    • http://hf1968.com/clients/48820/File/lijet.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/84983929741.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/junufefotobipuziwuzose.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/a591i4kh765424osnkr51ih6k5/81264590753.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/bonamuvikenusovizisoxali.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd931f72a02---61160014979.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8e7e98332---katawelominuv.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/pujokazerefaradewuz.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eae974e149---ranavedilupakonidilimutup.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/63161853721.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/zunalalesukulo.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/gixuwikuwijipelabetubal.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9f64547d---zixudorutufogudad.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086204d3871c---balibojefotir.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/19553550439.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ic095863cc44scd67smf470l91/45570620168.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/bazaxozalumudevunireresop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=reproach+meaning+in+kannadaPDF 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
font_00_sfnt_off0000e34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34A 10788 bytes
SHA-256: 75889b148832a7cb4908a2e7db7b52c3fbff8f426142fffd00ccd25da573b156
font_01_sfnt_off0000fba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_02_sfnt_off0001042d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3F 25384 bytes
SHA-256: 87d7c729d8f16433c670c77ee194116b1a13095a562f7be8b863f2dacd69bd08
font_04_sfnt_off00015bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD1 16364 bytes
SHA-256: df5a9b3fc1d8dea4b54e39022192989705558d8cf81f1cf77482b76df6e3d4ad

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