Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb004b8f0a4c2cee…

MALICIOUS

PDF

87.6 KB Created: 2021-06-27 04:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a5f04f8db60d181910d6dab88c4de5b SHA-1: 91d8665ace0430f4c95eccfee16c332cf7368966 SHA-256: fb004b8f0a4c2cee4aa052f14d5e14c97ea89ef3c923ce1f090917931d16545d
156 Risk Score

Malware Insights

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

This PDF document contains numerous embedded URLs that point to compromised websites, likely serving as a link farm for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with a critical ClamAV detection, strongly indicates malicious intent. The ML classifier also flagged this PDF with a high probability of being malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://crewmak.ru/uplcv?utm_term=how+to+look+at+private+instagram
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/6a1242c1bbb21a3079790b423b11f46a/mokoxuf.pdf
    • http://fra2ange.it/userfiles/files/kedukafojilofowakem.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/c8af6dcc87fb2ea93681d85a17cfe1e2/pabuvagovorixubuw.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/30e2cf10fa694cc62b42b40ee525eebb/mesupolokagi.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d8ffa553064f4160a0183a151d010b07/92952130603.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608091dd712bb---faxelalu.pdf
    • http://chaitraglaze.com/uploads/sofeneleroxibapazemujaba.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/06de7d58e5e232978e911748e985a4e3/vodekajitagimagudukog.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819c6727c28---zojezewo.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/spk70bors61tj7ija851t3iu8o/rejefutafexurojonutufed.pdf
    • https://myphi.biz/nbloom/fckuploads/file/labadizutoz.pdf
    • http://ekolojikweb.net/upld/userfiles/file/wasenixobapukagizap.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/f18d5e7f9772d02267e03d46e1539750/13353586615.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4935cff451fdbb5aa8c7eb70a6db15b9/bavezasivumo.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/da40bc5a1f8cff5dd273e75208a27dc8/balofidujejorefomokafafo.pdf
    • http://csc0731.com/userfiles/file/20210619182718_9y0vfr.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c4f5a248e---jukamobisuteziser.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/evto2p2gscppr3lfo0ic705gc4/17405575887.pdf
    • https://juniorclublivorno.com/sitonews/images_upload/files/pilodorulodexipodakaxideg.pdf
    • https://novahealthclinic.ca/userfiles/file/87588688093.pdf
    • http://irinaburmistrova.ru/files/95244783758.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/f2f0ftulov2f724d464m8j9ie0/2809697586.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ce24ea02---nenuv.pdf
    • http://www.cerathai.com/image/upload/File/91379118676.pdf
    • http://brmxn.com/userfiles/file/20210531072953_pzg9t4.pdf
    • https://b2cexpressdemo.com/userfiles/file/13308761770.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_off0000f340.bin
067f4e3efb64c3c63cc94e11dc3fc71ad984bdd6c8c5198688745a8ffb3f33dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF340 17180 bytes
font_01_sfnt_off00011fb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB4 16792 bytes
font_02_sfnt_off000137cb.bin
7d305f5a9ad642490ae05030d0227c3241b96fbb1077a06736b85bc0e38acaee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137CB 10832 bytes

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