Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65c9a065523ee1f…

MALICIOUS

PDF

87.0 KB Created: 2021-07-07 23:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88351498b3f60fb84fa6095957fb7a9f SHA-1: fb74472f73919d0b22d12331061fd2c90464b8d2 SHA-256: a65c9a065523ee1f495fe4f4aeb4cdbc5e7ca2d3ff2e505c3bcd700d425963b5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of these links suggests an attempt to redirect users to potentially malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/66466189829.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa7049b170---mejivubol.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609131808e70d---75360232828.pdf
    • https://appfacile.it/file/55581602721.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c06c2832eba5ed9f9d8a4064bddac00e/67217327254.pdf
    • http://chemonova.com/FCKeditor/file/14885004799.pdf
    • https://iqmuseum.mn/uploads/files/vigedu.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/evaociqq0sepi2v3niloliigt0/55229950330.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24a3389c47---bibixamupis.pdf
    • http://mmckno2010.zkosuchdol.info/files/44356829286.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8fae3c0c---79041822301.pdf
    • https://angkagenap.com/contents//files/jejobaduxanogafamogedaguz.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081598ca4589---9509698028.pdf
    • https://sankaibearing.com/userfiles/files/finevifevog.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f74a0653a2---fezosenabu.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607655064930a---2308848637.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608add64320ec---jovovamomuw.pdf
    • https://mn-lawfirm.com/box/userfiles/file/52399176886.pdf
    • https://people11people.com/uploads/File/77350628825.pdf
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160753dbd2a55c---kenijogosovodorolaboki.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc5980d1f1---85805660838.pdf
    • http://jinxinghotel.com/uploads/files/70195742958.pdf
    • http://sevoir.hu/uploads/file/porinivu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+old+was+nina+when+she+started+vampire+diaries
    • 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_off0000eec3.bin
092f5c9357d65f12b7c0b79713ff3fdf5ecdeff6c52abbe58f90b88788dc81d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 17232 bytes
font_01_sfnt_off00011bf5.bin
442a65a94fe06aa00645d6599629fdad00644e1ced50ef0bcf212a2376fc16dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF5 10800 bytes
font_02_sfnt_off0001349e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1349E 16792 bytes