Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad36bf2082801ed…

MALICIOUS

PDF

78.6 KB Created: 2021-07-02 20:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 624172d3030cb7f4ac20f99f9e2856b2 SHA-1: a413c0479ca6bf58c152b01a4185032b553d5e6b SHA-256: bad36bf2082801ed803041be338bcd9b9922f960ce33defeb6ea767c7828692d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to obscure malicious destinations. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The primary attack pattern involves directing users to potentially harmful content through a deceptive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://mayurherbal.com/userfiles/file/botipujajut.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072549a2315a---nuzeju.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/8vjtn5lgbvc3a1g604vhivpi7n/fodekofafimapirufunurunul.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f43eb91ac1---29107688178.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ca14145824ad7a1ade19b9d5393467a0/46885007061.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607891808e7fd---zozijedutamolusigu.pdf
    • http://rolmech-strzelno.pl/Upload/file/62924290428.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/d3nfes6k38jp1hrv5gf1itm70k/xekosise.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/be9503ed508c6764ddcae1db532e5b59/2510827847.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084877888534---xinomebanivudojazu.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a82910822ff---liluverataxakubizuvubet.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f3cf6b33f---lebudejevilenof.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/s79l8qj0te1pahgaud1qrpf34l/nesol.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a75472bedd4---xokedowomanosunotesabap.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075a1ade443f---74657503923.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e8e74a572---78922972189.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607612d55f295---36051971931.pdf
    • https://vvpta-irvine.org/userfiles/file/29531194138.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/g37lqrg706ft52ogmpkal0ja8p/leximewofumifowasaxu.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070689eaf81b---lorolonuwesiremufepida.pdf
    • http://alituncer.com/userfiles/file/pizozo.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d11436832---wusesex.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8c41c1d8c548d7dbfc975039413a7c38/87267049720.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/n1g0sd6ca6truk7an06f9it07i/34109641435.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/9a731134be006c66384411ec4c9a5c08/35543075267.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=belch+advertising+and+promotion+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_off0000cfd0.bin
8f5802393e623d2f1487babd312911489679377ba1bd0e1427790a5b28d3bb88
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD0 11188 bytes
font_01_sfnt_off0000e99e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 16792 bytes
font_02_sfnt_off000101b0.bin
b7da02fa12794ffdc03934b626ab02a5703b222e329b912ae89c0ce518598697
pdf-font-stream PDF embedded font (sfnt) at offset 0x101B0 16836 bytes