Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d2e05073c4ab24…

MALICIOUS

PDF

84.8 KB Created: 2021-06-26 16:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 097bb09bf1341efd8befccb499b1c186 SHA-1: 9a51f5ebd9d4a119a72c7464343a6e35850e8498 SHA-256: 93d2e05073c4ab24271c83168d6f894ea3e5731fbb3d47db352992bdec2dd3d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=another+name+for+light+independent+reactions
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/3d2a04cd6f80428bf6f55e5dc1397a87/97349738826.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fdd01dfb1---fuvewapevima.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/89873497bddf735ae9b66d5ff1c3b36a/47880496046.pdf
    • http://tz5168.com/uploadfile/image/2021/06/26/file/20210626_045138_132.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fb0e652f2---tofumepewetabela.pdf
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/84864697653.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/10e58942f65e6919b75b47bad9bd18a8/jufobavo.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ues3nj7iq5cktr511v3q6leb6f/luvidadim.pdf
    • http://lycee-elm.org/userfiles/file/34836451284.pdf
    • https://gabinetpro.pl/kosmetyczka/krakow/files/ganazerewimabowaniwu.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/3a2e106e2ac10efb8940e7a6f731288e/61406993955.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160752abd8eef4---fibikin.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16072d5eebd73d---maridekorasitijavijavoze.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087759bb4177---85488229147.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/966c4520a427ef1d0521fe987850f8c0/31644258119.pdf
    • http://work4shop.cz/userfiles/file/59672277973.pdf
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/psfio0ou5mpmf75nbicmfqq620/fapexexidezolejivifobizu.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce0e3787a1---lajezupirirezodetol.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c6e1dd37---71225649064.pdf
    • http://miroslaws.com/ckfinder/userfiles/files/xadogejipajidu.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160888e6bce825---rinefajekamuka.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607576773716f---99437448591.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b52a15ac9dc50b03f7ee2d6cb9c6a8f2/nufonewelapiwove.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_off0000e869.bin
3ab0e0836c13376f3933882fe14bffc5a1c1709055ce6650776e5de7d2620163		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 17040 bytes
font_01_sfnt_off0001146d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1146D 16792 bytes
font_02_sfnt_off00012c84.bin
60c059c07fb1c4784328770cd711d6093815507f3f9c357e93251338ce8f9f94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C84 11048 bytes

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