Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e20858cb38811ae…

MALICIOUS

PDF

84.1 KB Created: 2021-06-25 14:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c6b53bf93e245df1dfaa019bcb18aa5 SHA-1: 20af25a32635400ed83c1adfdb8c311058d1b715 SHA-256: 7e20858cb38811ae71b40d89ea1c1aa157f19bdf166457aa38b5533ac17fec74
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609218da88735---58722677824.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/42f2c7bc52aabc634a2b4e5efa09cd5c/xazidevu.pdf
    • http://pozitron-s.ru/userfiles/file/givereburiku.pdf
    • https://amd-export.com/site/upload/file/38369915531.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0c242fae---munisufidevuzasarugi.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a33dae9694e---58591368393.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f52c92236---63379204645.pdf
    • http://bukharageorgia.com/sites/default/files/file/turijofexebebi.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f05ecfeb6---romirereseriburutunajeba.pdf
    • http://pension-erlkoenig.de/img/editor/file/pevozurenabivejepag.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/58256091638.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b1467d981cd2170b12d884824382cd6c/moninajowa.pdf
    • http://ebiocell.com/uploadfile/file///2021062305073358.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/95bae042782c0c9d1ce8f3abf8d47ad8/kisetinakabe.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609059b54231a---12548214230.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c68b6a6b29---37549949474.pdf
    • http://ahcxdq.com/uploads/file/152315308450.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/6053e9454ece785f79c6eb8220279759/30365022814.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=words+with+s+for+kids
    • 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_off0000e9a7.bin
355db2a9f317b581ebb9fcf19a4ada85c946ed11d2ec2cdd0428f386ecd10060
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 10176 bytes
font_01_sfnt_off0001009d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 16792 bytes
font_02_sfnt_off000118af.bin
15af4479ce5df7c0015ad3e032a955aea96fbf8af9b89255b686bbb6ad30269d
pdf-font-stream PDF embedded font (sfnt) at offset 0x118AF 16756 bytes