Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc21af97d082679…

MALICIOUS

PDF

75.9 KB Created: 2021-09-14 05:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e7b8749db963fd1e4544e8bfe36b4d24 SHA-1: 5bac9b70ac3572fdfc72d50789dcf15797901381 SHA-256: abc21af97d08267979590d688ad85f26e39563dfadbad48059dd76bbc607db6c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a compromised CMS upload link further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 https://medvor.ru/uplcv?utm_term=free+harley+quinn+skin+fortnite+code PDF link annotation
    • https://xn--fct8ml6mwue.tw/uploads/files/supenerafuxinijili.pdfIn PDF document text
    • http://aprt1day.ru/file/49616451022.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/73203737333.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/jaxukuwasov.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/5001459161.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/barasofalofomalejifaken.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/zavujulixixusibegiwokegi.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/kidenupame.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/126f61b7e933389e8b522c63453885ae/49776982959.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/somokejusazepupeweg.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109072309045873.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/2228369318.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/kevuvenafedunivefifa.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210911_EFE704FB9D8F3DDF.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/46445053663.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ee85cbe67---mowusiditusufozonekug.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/84314648717.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/kejikuvowotejolerubo.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/mf8i3o7uje3j0lmglvhc18ftbo/71190509975.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/63976496512.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109081122403040.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/bamamobamoz.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/32749351007.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/21571390432.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/gokavifijuvorizubad.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///72528746337.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/53264742876.pdfIn PDF document text
    • 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_off0000c37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB92 11004 bytes
SHA-256: 810ad4853a12bfc3794b8665e0f4ce5a95995803b742a363dea0711b526bbf88
font_02_sfnt_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 17204 bytes
SHA-256: a3246b94166b628863ec4b10f299e6521f51a1cd426597546cafffcbf2de1f3e

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