Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa0b1342fcd05db…

MALICIOUS

PDF

70.6 KB Created: 2021-09-15 01:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d9c793467ad83e1a0fe8e68f21a6671 SHA-1: 33da9c0a4975b7ee4fe3cdef571b14a7cb98e340 SHA-256: 3fa0b1342fcd05dbe11b57ea61f91a12e5860a81e94614213db0893a95b688bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress upload storage. The embedded JavaScript likely facilitates the redirection or payload delivery, while the link farm attempts to obscure the final destination. The presence of multiple unknown URLs suggests a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f084b7c5f0---30942476136.pdf
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/19919326343.pdf
    • http://faradbox.pl/files/file/38979280392.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614117c6c52c2---21036144718.pdf
    • http://krevue.cz/UserFiles/File/47186628739.pdf
    • http://capitolmetrophysicaltherapy.com/files/files/47420711721.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/womufefowimevemu.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc232fc6f---nijusojotimilaxu.pdf
    • https://paklya.su/design/img/upload/file/70582551551.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4vsmtc6gsa9fjsobbi73ier863/27707709153.pdf
    • https://hlj-vibration.com/uploads/image/20210904/files/20210904101057.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/pf08eckcca09lfsa1lotti36mr/57347491692.pdf
    • http://vekosgroup.ru/userfiles/file/dugibexetusaperet.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8e3nulcmjnoddphmso0drthi2/nawuderewasirimexawu.pdf
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/9178106701.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136f166be7be---88912710430.pdf
    • http://seamcc.com/UserFiles/files/39714310607.pdf
    • http://stimatacasa.eu/userfiles/files/43394998979.pdf
    • https://5of7edwardstreet.com/assets/media/files/defasati.pdf
    • http://upakuika.com/img/file/voverisifexigon.pdf
    • http://www.naraihillgolf.com/admin/userfiles/file/novobigemetiriratif.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161410efe9ec7e---54091104715.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=shareit+v+4.0+apk
    • 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_off0000b1ec.bin
4d963e121c6f92ae4c01ecf3bfe0b2b26af56afc4bac0b774826020e6619a860
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EC 10408 bytes
font_01_sfnt_off0000c9c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C0 16792 bytes
font_02_sfnt_off0000e1d2.bin
03e2b40e373623080bf924ac5d32760153be2bb82887f25443978624d21709eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D2 16988 bytes