Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3656b84ecdab09c…

MALICIOUS

PDF

85.0 KB Created: 2021-09-05 11:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32db6e18157dc8250ab2144447f45e02 SHA-1: 97940391be18904c78e7738ddd56917da8fb99e8 SHA-256: f3656b84ecdab09cc981799cff61976b820da60b73ba1af4a7a66af2aa58f3e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://vantaibactrungnam.vn/upload/files/rafezesazabusipaxem.pdf
    • https://bocion.com/ckfinder/userfiles/files/bevipefujuviveto.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/suranekufujoj.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0bj8qkbok5tl5ttiqbvtt4l626/gazebutuwovafonimitusipap.pdf
    • http://bobiniauto.com/userfiles/file/7813318502.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b9cee008---kokabuk.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3eaacc250---64578378305.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/185706117c572325a1a7ed4e3e91c8dd/xetenokerebaro.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/d3026c8263e59a274bb3012578ca6a4a/71924960683.pdf
    • http://tayles.com/uploaded/mofoped.pdf
    • http://maility.pl/_ADRESuserfiles/file/zufavurimigugamujusix.pdf
    • http://smepil.com/ckeditor/userfiles/files/26269544569.pdf
    • http://2990592.ru/ckfinder/userfiles/files/jupum.pdf
    • https://angkoronetour.com/userfiles/file/47898250859.pdf
    • https://baohohoanglong.com/userfiles/file/poman.pdf
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429214336846975.pdf
    • http://laptopplus.be/app/webroot/files/userfiles/files/tonirodowokatusigub.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/ec99e070c723be122196deae54ad9950/90287046929.pdf
    • http://cerrutistudio.eu/userfiles/files/44515768760.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779d7c8aa00---balerimizorumage.pdf
    • http://al-bandak.com/userfiles/file/34725689195.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/72f7f98eda381ad6c3ed8da59fdf6901/84254806593.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f519bbd58b---kolononubomupigewetamida.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/09b0a2a95187451abd9a4994b5c2462a/tofibojutikenajide.pdf
    • http://grimastone.ru/files/gexokimadejete.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=juliette+el+marques+de+sade+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_off0000dd21.bin
5903025a95fa8a4663a4d00260f394e2040549d2432994f29cc671b9612e802a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 10672 bytes
font_01_sfnt_off0000f55d.bin
8002502518a60b85ac5e65e6cb17064bb72f7a8a9f67492c2d3b6706ae8f8e80
pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 21804 bytes
font_02_sfnt_off00012d01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D01 16792 bytes