Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc2e2b77e6e7c6e…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 01:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e496a6c84d1842ebd978d674a7c8230e SHA-1: 34579f942b2eaa42f4e7b0c14434b0099fc7db8e SHA-256: bdc2e2b77e6e7c6e14691f3f4c0592af729cc3398434ce32f0a849f07208e9e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and functions as a link farm, directing users to multiple external websites hosted on potentially compromised or disposable domains. The presence of JavaScript suggests an attempt to execute code, likely to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 http://chinawin-consult.com/userfiles/fotijafelejilijexom.pdf
    • http://daglichtfilters.nl/ckfinder/userfiles/files/xodenejowulitap.pdf
    • http://mylodge-naoshima.com/images/blog/file/47549759872.pdf
    • http://thegioimaychaybo.com/app/webroot/uploads/files/zalome.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/4da3llqdp5fbcsk6ot4u6q3rcl/fubas.pdf
    • https://senesi-sklad.cz/userfiles/file/lifafimujomuwalivesixano.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/21419996359.pdf
    • https://vanphongphampmc.com/upload/files/54811273673.pdf
    • https://assignmentmart.com/ckfinder/userfiles/files/zesanologoguwemawe.pdf
    • https://asztromiskolc.hu/ckfinder/userfiles/files/22753625188.pdf
    • https://beldapin.com/calisma2/files/uploads/jogufi.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16150bf5095938---26892380578.pdf
    • http://quimis.net/js/ckfinder/userfiles/files/tuvugovidivuze.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612eee6b2112c---13441228105.pdf
    • https://nocenzura.space/web/img/podborky/files/19551611897.pdf
    • http://quaint-house.com/images/blog/file/36643194254.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/29b79a29c88b22a8c29b27f9b43b6514/87531288327.pdf
    • http://originalbau.hu/imagesfiles/43359058378.pdf
    • http://suphammamnon.org/uploads/files/16582890468.pdf
    • http://ctcinsulator.com/uploads/file/46092225281.pdf
    • http://sevenseahotel.com/uploads/images/files/datudokozepivevovebawosa.pdf
    • http://ghinelliarchitettura.it/userfiles/files/64708669109.pdf
    • http://compow.net/ckfinder/userfiles/files/2579244213.pdf
    • http://kameleonhastanc.hu/files/file/wewakigekes.pdf
    • http://ikra-ekb.ru/files/fckeditor/file/1269276653.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=wattpad+apk+android
    • 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_off0000b61e.bin
da973d8e8cb65acf5e8ab6b038f92ecadce051141991a719a68494e0fd8ea21b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB61E 16852 bytes
font_01_sfnt_off0000e0d7.bin
6d72a093aa6e182b66fd2db4f5c4e8654f4b2dfd318ec9e5fa8301da38fcceea
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 10124 bytes
font_02_sfnt_off0000f786.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 16792 bytes