Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08cb19a33ac3f3f…

MALICIOUS

PDF

85.6 KB Created: 2021-07-08 04:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ca150a52876df0807887d62e31a7a50 SHA-1: 7f52837f7f8d9982fb4894e2551fa96311de5467 SHA-256: d08cb19a33ac3f3f4ac95ab8ffc92f6bd659a521b81aa210329a41ed5422ae4d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and disposable hosting. These links likely serve to redirect users to malicious content or phishing pages, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://cructi.ru/uplcv?utm_term=i+am+not+looking+for+somebody+with+some+superhuman+gifts
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c06778f85---fosijover.pdf
    • http://www.siphonicflowmandiri.com/upload/files/91351761646.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/c11bf51dee08d9c6a27ed865fa0286e6/47957491708.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/a3cacd3f27a7923e07cb9b2cbdb7e86f/57262458555.pdf
    • http://amphorabeautyclub.com/campannas/file/bonumovade.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6010d2a26---tedafozivomelonas.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/83f2dc987cfb21d30825afd6c60f1d77/divilazigekefi.pdf
    • http://jatyn.cn/upfiles/202105/file/1621245450.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cb2a4772f---figagogakiresefu.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/2jkqhuq9bnjukguoue129esrok/nawuxadafobese.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a00e80565e---rogopokipaveweve.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e504ca3672---39655037095.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd03c339b8---poveguzawuwa.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160812a27ead03---99048065339.pdf
    • http://kp-technik.cz/ckfinder/userfiles/files/55190791812.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0ef21ca583e7ef8f7d6bf919e9878928/zijuruv.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085afd051c05---6436281425.pdf
    • http://beamstraffic.ae/amb/userfiles/file/31512190815.pdf
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/f92e487968daaf9225e7742d72d102f7/juwavogawabapivefofotow.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607c898845b18---tukajufilomipu.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e1ad305291ad18e05ecfdc4a166ab0b4/nomujenasopuz.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/e55616b67ce41584f15eafba43937b7d/47161874090.pdf
    • https://vnsteeldetailing.com/UserFiles/files/larez.pdf
    • http://indovinandoilmondo.it/themes/userfiles//files/tuzub.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d29f.bin
b46c2c4cb0d875502aef954a947489bc893c9ceda01aa5b0553cb870b1871442		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD29F 16652 bytes
font_01_sfnt_off0000fe1b.bin
ceaab6e08beabc1850005f77aa7f5d8c7121c2f61bd68da322b53ad8d1867cbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 11428 bytes
font_02_sfnt_off00011880.bin
27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11880 16160 bytes
font_03_sfnt_off00012df9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF9 16792 bytes

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