Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc5bc46cb0d2fa8…

MALICIOUS

PDF

85.8 KB Created: 2021-06-25 20:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1fc00d7e77ea63d7e0b02bcc87b70ad0 SHA-1: ea156255d9fa854a698048e70c3c69e89acdd8fe SHA-256: abc5bc46cb0d2fa8467b2b98a1dacd373d3a32f9d74c6691af000ce8cee45455
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09b82dbb64---kozologalesuf.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9e14d0c7e280a0604a1e40b78c78d4bd/55521773717.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/9sfv1qk82siraiiiojjskqjkb2/nofimomikiji.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160802e64c33dd---razogekikekewenun.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e307ea87c---rididagetusup.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/a69530c364dfdbefcf6481e45d278d46/55019540871.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64e653a870---wovod.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093f9e03c5d0---72388998197.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb36f947e3---93677270393.pdf
    • https://cristalensi.com/public/File/16700231504.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/21cfc18b347dd196a8ab9e4ca1cc8d44/9850746671.pdf
    • https://irisapp.cn/uploadfiles/fckeditor/20210531/file/16224570204811.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608038cc86e2b---48673745456.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/07tmqv6g8vtkb9h5l2s27ms784/dusamisoki.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072719ed0db3---59464748950.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/dd84ca7175c6c61f2c1d5cfc15a4cdbf/4139837276.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b145c32b9abd1a1bf908f4aa116f5e6f/pidokakafan.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/81efb1f29816d2ca6b7f0f503a33a1b2/36774205855.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/cea82b3187892e2e01cb9aa07a3170aa/99257083642.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/b9a9ff4b143f9ff7d94cdd249d6a517c/xikud.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/ade9a17d725bf7629fafa43d287f41df/37986311563.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/cilb43qbk9grrlohp35ndfafjg/wovusupazozenetibujet.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/50c06bde58bed9bec4fc8c6e1f94db6d/detosukibebojoligo.pdf
    • http://wrtour.com/FileData/ckfinder/files/20210531_3EEA2D93966A03B8.pdf
    • https://esprimagroup.com/userfiles/file/3553796502.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac21f08b4---83268431574.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=grocery+tax+in+illinois
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec6b.bin
651a2f63c08a5aff31bbea18e89d12673429091d364b1a81e845f65b060978b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 17236 bytes
font_01_sfnt_off000119c5.bin
3a3e7f43ecce90cde9ac61e39c96eaa6843dddfac5c7bd60e9b3943d29c3fff1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119C5 10476 bytes
font_02_sfnt_off000131c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131C1 16792 bytes