Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93fcfcef6b7e559…

MALICIOUS

PDF

88.1 KB Created: 2021-07-08 21:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 149b07b65b0c31eaf66a9b407ff6039c SHA-1: e4354fd97f7c0de84205b1e847e0bdcabccddfcc SHA-256: b93fcfcef6b7e55939e87454d365f91c56ccd62126f916994d7414532a516970
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to external sites, including those hosted on compromised WordPress installations. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://ketchas.ru/uplcv?utm_term=please+be+polite
    • http://latexindia.com/userfiles/file/kemimi.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3179c99d6---7106345901.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/68a460aa52d870d95ca5df082edcf33a/59699960258.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/bd5ql206prdldmf35nkhao875a/rotuzavimeniredetimaxiju.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160852f7db3144---labenimemonisitutoguzarav.pdf
    • https://fong-cai.com/upload/files/62200570375.pdf
    • http://www.asap-recruitment.net/upload/file/21848285513.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c1df00dd---42744165046.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d147385526---tinatokigekulawof.pdf
    • http://maychamsocda.vn/images/userfiles/file/70416659037.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0733542a06---54836218959.pdf
    • https://penzionradvanice.cz/res/file/vigefolaxu.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/f6de3faa6cc94cc4e6da07c17f27eafa/60117576676.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/tjqe362bqk83ekr0ublomp0nk0/35098074113.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609d351eb5ac9---sofutibozale.pdf
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/61280480958.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e2580a9b79d---zimorutebobalomapeva.pdf
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/83724743050.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160739613b2c26---vujupepev.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c21002c9fd8---50052312210.pdf
    • http://rheinmotel.com/userfiles/file/88486124741.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/67fa1cba9b041c45f099200e3c6e6cad/64140505080.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/7gsra7a15k62pu7kbgb70fg626/pozifaje.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/61e84963a8620417cfa1e7abfefcc911/68653975536.pdf
    • http://mea-travel.pl/userfiles/file/dasilukegatitizitado.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/186b1b3d02d0ff3b41a082ce12a6d436/lowewereropi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee66.bin
c1c5b5a97408c51e2e0edc8dc3e54a320dc0659f91f51260cad0a826ec70e094
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 10184 bytes
font_01_sfnt_off00010514.bin
6506aa6a58c7a016e1b1f27e33f43dcb4edfdea674c21e0052472fc6bcada206
pdf-font-stream PDF embedded font (sfnt) at offset 0x10514 2100 bytes
font_02_sfnt_off00010e95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E95 16792 bytes
font_03_sfnt_off000126a7.bin
d9293a432e49704784b7d6807a327bd4c2f532038d7eb8beeae7bb09db001dee
pdf-font-stream PDF embedded font (sfnt) at offset 0x126A7 16940 bytes