Malicious PDF — malware analysis report

Static analysis result for SHA-256 af79473193edc477…

MALICIOUS

PDF

85.5 KB Created: 2021-07-02 16:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4b3a911ab1f97a45fab249cae51e587 SHA-1: fab8cbbcb9dabc51e757ad481cd6435e470d7f7d SHA-256: af79473193edc4770d39429b5d8bbfd764b8958fe2c0feb4ee9c61d59ac9b1b4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=delegating+coaching+supporting+directing
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7a935cb1f---46794968522.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160831c3a0f645---19319717993.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608067491690d---46717514446.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/49a9d22b79285da825c4113d62e44a7c/43868144246.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777c86f21db---93606978735.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad8f2d817---56095196880.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d1c72cd7---58214215581.pdf
    • http://aivieksteslaivas.lv/userfiles/file/99401884969.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58f04711c1---53676932529.pdf
    • http://ahkjt.com/upfile/file/lilexajopotave.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d093d66b5---29032315717.pdf
    • https://delphin-restaurant.com/ckfinder/upload/files/vanitugezuzafudi.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/7822dbd5fefe6d11ad2141e8c8ea3f23/82914176020.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f142046d1d---67687635800.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abeba0e320f---tazimazalolapofe.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af8ab0b206---31262300290.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/9174366a088806156b9168653230d739/danusutasevoxib.pdf
    • http://i-dron.cz/data/file/tuwuwexaxukasu.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d7e283fcf---97018672705.pdf
    • http://hitecds.com/userfiles/file/70152291139.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/7115537ddc79ff464a9985543a16daed/49845194460.pdf
    • http://modnyi-buket.ru/uploads/files/55933258907.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078d90d8f563---zofonezo.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//87293154852.pdf
    • 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_off0000e946.bin
df1c99f7e74feddfb3c5766ea884285e4578e672984adc1c1c27bae64b374f4e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 10896 bytes
font_01_sfnt_off00010238.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 16792 bytes
font_02_sfnt_off00011a4a.bin
d85a8d288cf5f2ff34e772d973b4f974d0fc1ddca4a1a3096e28df4b8eeb0cc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 17004 bytes