Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3610395bc551d50…

MALICIOUS

PDF

84.1 KB Created: 2021-08-26 12:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 112320257d1e000f27e5b0388e916592 SHA-1: 3c06393ac691c40aa0465478f7c6130a8372b4ce SHA-256: f3610395bc551d50002c490c791a17b601c03f01d785dc2b6f5a149a8d817b47
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to websites hosted on compromised WordPress installations or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further exploitation. No scripts were extracted, and the document body was unreadable, but the link farm heuristic and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mimpishiosatu.com/contents//files/bojaxuvibuvoji.pdf
    • http://viajesalaos.com/webroot/img/files/dugizuxidulokalujikos.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7276fc7e91---76169734524.pdf
    • http://fst-uinsu.net/userfiles/files/67787745833.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/bcugrsqimbh0g009u5pht65fo2/legemif.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608593faad8dd---rulukel.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/4f2abf58f55491ffe5c115ab630cd249/92421487426.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16074f9f185bfb---lakirarowarelesixu.pdf
    • http://kd-council.com/upfile/files/zijedepa.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/53js27u8qkne51qqsdl5i2446l/27083735850.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/352ece1b2f3cfcf514313531e34e3eca/3535313185.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e0b63d0f507aa03dcd110f8d8afb06ed/20981473131.pdf
    • http://joy05.com/_UploadFile/Images/file/kigeduginofakikegug.pdf
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/nipobubube.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/85696338074.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/caac9cef7ea29463bf6b95732f2fcf25/zixewigudof.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e4d289cd9---zivoloj.pdf
    • https://plentis.eu/ckfinder/userfiles/files/jugegulijemitu.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/fd950d1bae85d5e38382a5e369c27dc6/26896391997.pdf
    • http://855solution.com/htdocs/cljr/data/files/dodimiwabajerumawudejeb.pdf
    • http://mkbeauty.vn/luutru/files/41285358299.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/gs54utpfrh5qdhs2p1i2sgh9u9/27468157553.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bc3f1d925---5568189949.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bd92aef629---tamoliwutisitagaga.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b2c5d47351750034eb3c00c52201b021/nujufujoruwinojab.pdf
    • http://houstontca.org/Content/uploads/files/99084959901.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161036fed9eb18---bimafunufokaju.pdf
    • http://georgekoldun.com/var/upload/file/lijemupabozunizososinuji.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=head+hunting+meaning+in+hr
    • 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_off0000e5a3.bin
28b7074b8c3ac6c8c954d002892f03b3ac3fbc3be4f8b75885ecea3184b81d48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 10452 bytes
font_01_sfnt_off0000fccc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 16792 bytes
font_02_sfnt_off000114de.bin
857a459d99ac56c2f2fb2dc9bc1e41da853920653dab3c7d9906a14eb75fd47a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114DE 18264 bytes

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