Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3eb3cf000c17f6…

MALICIOUS

PDF

73.8 KB Created: 2021-09-13 15:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53506d780a3c1da9a5165ffd7e37a0a0 SHA-1: 940bb8fd0baa99ff5923800b0a64368f0c0e33f2 SHA-256: ab3eb3cf000c17f6cd5c9838cc139659f9690cf074c3986163bc6cf40fbc9fc9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://jeanchapleau.com/userfiles/file/87204508374.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613797d996d43---devafejopipuw.pdf
    • http://sushigonewildtogo.com/uploads/files/19504715152.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9c484ff03---24832677113.pdf
    • http://beachfirebrands.com/userfiles/file/68635672343.pdf
    • http://casadiriposomarsala.it/userfiles/files/melamuzuxefuj.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395299a1bd1---mewixujafogorulib.pdf
    • http://gs-metals.com/filespath/files/20210912114506.pdf
    • http://espaciocultivarte.com/ckfinder/userfiles/files/77990952266.pdf
    • http://advocaatindex.nl/images/uploads/70207686762.pdf
    • http://thibangoto.com/app/webroot/uploads/files/punidimi.pdf
    • http://mega.kz/media/upload/files/45420115863.pdf
    • https://loyallcanada.net/editor_files/file/fipuzoxu.pdf
    • https://108pizza.pl/uploads/userfiles/files/bozesipiluki.pdf
    • http://keystoparadise.com/userfiles/files/9845104618.pdf
    • https://gopherscopes.com/userfiles/file/75827266160.pdf
    • http://mybed.tw/uploads/files/202109131950404408.pdf
    • http://ymmicro.com/files/files/1767861742.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/dfe110e96e6096f902068a6944636f84/dovovujeduzujokokunumekid.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/e1ci8ko8k5v8q3mfp3k72uibpe/dedodadokekapalek.pdf
    • http://suvagcentr.ru/userfiles/files/26458724639.pdf
    • https://rewaqousha.net/userfiles/files/vamipimolaninikegojigaxi.pdf
    • https://photopoligrafic.ru/ckfinder/userfiles/files/lejikix.pdf
    • http://speed-r.com/js/upload/files/dubazaninugefajabu.pdf
    • http://chenruichem.com/upload/files/67340616711.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=8085+microprocessor+assembly+language
    • 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_off0000be06.bin
17ea5460fe045579c4c4e266f1f257c6156865a45bd047aa1b0edab9246ffd90
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE06 11340 bytes
font_01_sfnt_off0000d876.bin
fe3baccb73c02445b12ee777236328dc924858b7d8a80ca6452e2442829a13d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD876 16024 bytes
font_02_sfnt_off00010165.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 16792 bytes