Malicious PDF — malware analysis report

Static analysis result for SHA-256 1397fcb775635625…

MALICIOUS

PDF

80.8 KB Created: 2021-07-04 21:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea4227a839b5f0e6975eda3c6d5b2942 SHA-1: 4c6b44469c9cf60b6be2eef2f696e68905196292 SHA-256: 1397fcb7756356252521cc34aee726a2a8331bc2e33141849555b4d6a62f7751
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised websites. The primary purpose appears to be redirecting users to potentially malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://karinbentum.nl/uploads/file/zeliwesixadajireli.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/434b94d28e597842b755a4c63491750c/bajafu.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adccd074937---17872526160.pdf
    • http://abpaluso.com/upload/file/gibeja.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160767ab4477f2---jowirawowusovipewolu.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/2499cf82d97264d2b2762ae9099a0de1/kozonasuxubamebetodo.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f298f14f0b---54675670905.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf5152b9a---pimuredawofaxilutexase.pdf
    • https://mmgrowersg.com/ckfinder/userfiles/files/37164489442.pdf
    • https://xanbiente.de/userfiles/file/97201587911.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/90830160876.pdf
    • https://bharatbiodiesel.com/userfiles/file/kinikorujaw.pdf
    • http://mispuntossaga.com/campannas/file/13151723370.pdf
    • http://myjobcareer.net/userfiles/file/2021052515271373499.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/1de19b3c6d436d44c630d285a60cbdc9/ritidonuzofawogodego.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ua2itt9vjbn6pbd49kpd71c2g0/18059152145.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/fae98d7594a169730da74e79d8985d87/66605746407.pdf
    • https://lawina-radom.pl/files/file/3110180844.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/76c05dcb4ed93160f666529215bbaeca/fetoxugitaj.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc82a817ef---48801763955.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b1c7159ef26---90262392739.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bac954962---kasasajuxudukapure.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609526b417086---24588741165.pdf
    • http://divorcefinance.nl/uploads//file/66188480368.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809a752e6af---negegopulekavisunez.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/83a329c53878331ce6febfe8434239c3/43344012864.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=dcast+library+in+r
    • 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_off0000db33.bin
25e153545f5c55bd8a35f7130cce42a16c516158219621b891d2d8cd64b736e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB33 10224 bytes
font_01_sfnt_off0000f24f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 16792 bytes
font_02_sfnt_off00010a61.bin
9a879ed0ffd5fd22edac29b0e19a27e93c17aa7cdb91205dab34fd050226df37
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A61 16748 bytes