Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38a52996d0eb071…

MALICIOUS

PDF

82.8 KB Created: 2021-10-06 13:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 29aa061b385c5ab5960268fcfc6baa1a SHA-1: 80a9cd7d98212217eff64a38ac9b463ba9d4e08a SHA-256: b38a52996d0eb0713a7bfbde156fb5deab84dc274a49036d669850c06725eb9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm designed to redirect users to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16159bf3617ae5---jejinib.pdf In PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/66640112451.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/jegalabufe.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/44654903ddb1d3ae7f793b83f52f02a3/95482368841.pdfIn PDF document text
    • http://ametansk.ru/uploads2/pijunov.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/nulekaromitunedevomola.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/3248985141.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/60651057560.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/d86832e03092b938d2372509353f8185/3593912814.pdfIn PDF document text
    • http://househouse.it/userfiles/files/refaxexuwebewisaper.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/vonawetikutikofowubema.pdfIn PDF document text
    • https://betsin.org/userfiles/files/66399568926.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/puwoxuren.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/54269893734.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/64441464319.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/xejalemesitirofuzemotat.pdfIn PDF document text
    • https://qematalsihha.com/ckfinder/userfiles/files/80832120086.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/jelip.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/31866295526.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0924/49a07c2d76076a132c30aaba30c93d93.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/paxeliv.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/bewariwadisurijomulifusa.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/towupupig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+fix+nellyPDF 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_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 9840 bytes
SHA-256: 887f0689a30ba5f54ef44e760c62ba4f8a476c77c5c2a64af20e2172a4b3d08b
font_01_sfnt_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 21348 bytes
SHA-256: 32c83f0a071c887a1255d1f1e162d869771379c4f1bd1949562c88d3b47f9b3a
font_02_sfnt_off000125f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1