Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e938fd4540a3811…

MALICIOUS

PDF

76.3 KB Created: 2021-09-14 03:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3dc0eab78678a14231b523dbb11948cb SHA-1: e752a534b00872b33c163107bae528035ad14c0e SHA-256: 6e938fd4540a381116fe486395be9745f6fe63b83eff73a3735f416d623aa846
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a large number of external links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • 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 https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a6b5672af6fc1cd372f79bca1ab5caa1/masuzobavoruluf.pdf In PDF document text
    • http://glovimex.com/uploads/ckfinder/files/26605185988.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a172e5b699---xemiz.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/66268885060.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/74235849809.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/63175397825.pdfIn PDF document text
    • https://camelcarpet.org/d/files/keruxa.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ddfebc5fa---widal.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613084b69df4b---xagarebatigigebumufaja.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/35075861464.pdfIn PDF document text
    • https://dintek.eu/uploads/file/mogezikujexogudoges.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/fumujagagiriv.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/punaparitunovo.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/7935825052.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/31830059087.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/tovolugibufep.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/12093847838.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210904180655.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/90160332881.pdfIn PDF document text
    • http://salkim.com/userfiles/file/rusuxajedipuxanenukasuz.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/34288741362.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/72771946274.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/33246297782.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/58863305756.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/42948574363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pubg+cn+version+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC544 10804 bytes
SHA-256: bd34d817c8e432d4e3743d9abb5c0e971b4562ca1f827baa3b671ecaa799bc7e
font_01_sfnt_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 17888 bytes
SHA-256: 6db85d9dc0ec61b880cbc0aa78afca7c9dc25ff35356a77ee23ffd706cd0d349
font_02_sfnt_off00010c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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