Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa0464785b2c0ca…

MALICIOUS

PDF

82.8 KB Created: 2021-06-28 00:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28466f587bbf556c0d72aa0dfcabb898 SHA-1: c2fecc7103982030fed5d30876662f95b328b540 SHA-256: faa0464785b2c0cae09e3aacdce2813fbe6c699ee7799bb6e0975ae6fa094216
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the file being a link farm hosted on compromised WordPress sites, designed to redirect users to other malicious PDFs. The presence of external URIs and link farms suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5350c6135a---bizoviro.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a95313ae55f---24221329804.pdf
    • https://asiquim.com/ckfinder/userfiles/files/tonokutisubajapejul.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc869185ead---mudaki.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/de8a96dff8cf9926bbbec0bc14b97f3c/89158971517.pdf
    • http://absolutelyneon.com/userfiles/file/zotoriwozawuluvemelafiras.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f4528b2b7---ravebedotavefomik.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091583bc0006---badunigopuvajakukepirib.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc86f6cd33---ragadipexod.pdf
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/72256077123.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/3i2dn2b5klpoi6v6jtcu1c7t8a/mirugi.pdf
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/7f0b7b4b92af12bca8f7ada22eb677ee/19364818965.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077600c3e6e4---10344511519.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8e244072e---desun.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b8f6d4028---95097205449.pdf
    • http://goteneplast.se/files/images/file/81733919951.pdf
    • http://mp-journal.com/media/file/golenotiso.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095938a63b27---13674007692.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a28ef15c5bf---jovideduxunolajejot.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2vdi2aagbs8s7vb4pg97ajg0a0/698761533.pdf
    • https://tort-art.ru/userfiles/file/91566702562.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a150a0a4312---9508735641.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=types+of+cuts+of+vegetables
    • http://s292376414.onlinehome.fr/datas/imgmail/file/wifuwu.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_off0000e0a6.bin
77cc09a2e0e0ff1533c668a2071b684a42f48aa2bfade1cc909e2e0d72c24db9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A6 10740 bytes
font_01_sfnt_off0000f96d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 16792 bytes
font_02_sfnt_off0001117f.bin
24d051fbb687d37e93070fcee4f6ea290478b6c8a881f1507d1459929ded48b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1117F 16604 bytes