Malicious PDF — malware analysis report

Static analysis result for SHA-256 b492329c0d2bae47…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 15:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 930ff9be39c6ccc26efa95a87fb27b87 SHA-1: 0d767d419efb390a7772df1cdb325d4751788451 SHA-256: b492329c0d2bae47102b1bda978797810219a6356ac2c710c65b63183d3de1c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs and link farms hosted on potentially compromised or disposable domains, indicating an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it is designed to conceal its malicious intent.

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://queure.ru/uplcv?utm_term=molecular+weight+of+na2s
    • https://prtl.pl/userfiles/file/38687347925.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ffkamrd73hrmvr7fegpn7qrvn0/86882019482.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d8b3ebfba931ffd20c7b93b086726083/14682325931.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b28de2dcc92---41577524030.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e002a6c40---dosurozazesapoxigasuraje.pdf
    • https://www.channeloflove.com/ckfinder/userfiles/files/59083711837.pdf
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8131089d---kebidavuxanibopafuban.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/coidbg58jbsiovb3cu9r8n3k7l/51685920988.pdf
    • http://dienlanhtruongson.com/upload/files/75844220603.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/9e80b15a341afe1d6f6c9ee4ffd04081/44952840703.pdf
    • http://iberia-ex.com/images/blog//file/80538448767.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/2er6284fsbaledcic868iqm9oj/83549220708.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074349ad20b9---vawutolafawusezome.pdf
    • http://nsdadventist.org/FCKData/file/zesawuwer.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/51d8b2e0947f8991a57c167932b2ea8c/niromija.pdf
    • http://beveragesgs.com/userfiles/file/49799383000.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/51d35565d8bf5f6898f351abb8bf8e3c/suxokelidokudupuvem.pdf
    • https://kp-bs.ru/upload/files/20083015654.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ff02fbaeedc---mibetedemef.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb671395efe---sujodimilapurirugome.pdf
    • http://fszhenjia.com/upfolder/e/files/20210528035059.pdf
    • http://bluecars.pl/userfiles/file/kowumuboligizotedo.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a08e9f86823d15c9b3df3e93f504f938/67977005202.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074d4a238ba5---joguti.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f752200d9---sipevofebifudil.pdf
    • https://equimat-cheval.fr/file/34480523681.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_off0000ca0f.bin
6d0aa6746dc9ef564622e404c4b15f940a5a34bc0a3b007060d5ad5f39f6925e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0F 10912 bytes
font_01_sfnt_off0000e36c.bin
6119cd62d3b2432a3ba625bd2323abf1fcf11a23022890211419979fe0724c67
pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 19096 bytes
font_02_sfnt_off00011537.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11537 16792 bytes