Malicious PDF — malware analysis report

Static analysis result for SHA-256 305d88e12b4d48b7…

MALICIOUS

PDF

70.1 KB Created: 2021-09-16 21:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 937afe04d431b564681d39b88edbfde0 SHA-1: d4ae69501f3092de96335909be3deb1286bc93db SHA-256: 305d88e12b4d48b7a164deb36b26b00af4cd93c977132a8d23589a473cb9ce15
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier assigned a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with numerous external URIs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF link farm indicators suggests an attempt to distribute malicious content or phish users.

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://allytemp.ru/uplcv?utm_term=pixel+cast+to+firestick
    • https://alley.52886.tw/uploads/files/26191664552.pdf
    • http://onsijsselstein.nl/userfiles/files/81782386523.pdf
    • http://dochoiotovn.com/uploads/userfiles/file/97601604105.pdf
    • https://noursportevents.com/wheelmarine/userfiles/file/nezepubegoninuwidixuxape.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/4f027add01e7ac85d382cdbbe647d310/47950661065.pdf
    • http://henghuitong.com/jingkelun/userfiles/files/20210913045237.pdf
    • http://fandimnarodaku.cz/upload/file/69852490101.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc4a592318---53820331911.pdf
    • https://equator-maritime.com/userfiles/file/voteguzimiv.pdf
    • http://svazekobciorlice.cz/userfiles/file/93955149013.pdf
    • http://findingthegrey.com/userfiles/file/17248874906.pdf
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/96845123500.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ebc3a8dc5---befagebe.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/v0i269e8adb48e7lt4i595abom/xugutikogejibutuso.pdf
    • http://tulga.ru/editor/files/90107347080.pdf
    • http://di-tech.kr/fckeditor/userfiles/file/xizejuzakutepotosepexe.pdf
    • http://3e3i.com/UserFiles/file///3711819180.pdf
    • http://camdohungdung.com/upload/files/jovipelur.pdf
    • http://sistersaviopublicschool.com/userfiles/file/duwexusuzok.pdf
    • http://www.cda.org.hk/ckfinder/userfiles/files/84677345384.pdf
    • http://kelsenator.com/userimages/9033917950.pdf
    • http://thanhnienxp.com/vietkiendo/upload/file/17913488518.pdf
    • http://www.agenbenangbandung.net/file/koveruloxe.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_off0000b2ce.bin
c32860d9dde0022a81478dfa45491237b84a374f1adcf8d79a246c49c39b20f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CE 10420 bytes
font_01_sfnt_off0000caa0.bin
4e5a14ab25e0acf4c3d79df683b0e923d8b67d1d366bcf153112fe933ed7c396		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA0 15712 bytes
font_02_sfnt_off0000f343.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 16792 bytes

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