Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9380b6d14de1e00…

MALICIOUS

PDF

81.4 KB Created: 2021-06-29 18:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be3c9995ecb0a6132c548834b0d0bb75 SHA-1: ebd61f595d4fa119df968f71f48c23456274365e SHA-256: b9380b6d14de1e003342d7a1ac2cfe119b0cadf52ed825cbed531cee680d73a1
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDFs. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a7d195cb2---japipomido.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be08293ff3---pibinagirixuwikiwa.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/hokie7g43h4ej74vu52mtcqvjk/50987282373.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b31c7f81---75914025798.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f8fd15af1---75125867793.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d15af649a9---75012793842.pdf
    • http://sangiorgioautoservizi.com/userfiles/files/41072371832.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607629f713e31---97229200110.pdf
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/77871277384.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/ns5e60cnejp2kqmcfgebbb6ofk/3129367843.pdf
    • http://amuseonline.com/absite/userfiles/file/74266941553.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/dfdb68fba066be44a7a1701b16d2ea81/91998235211.pdf
    • http://kaztelcom.kz/ckfinder/userfiles/files/vipum.pdf
    • http://ducthoaudio.com/upload/files/poniriturararizu.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/2l7skr9luh543i12hsqf09292k/49535248903.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce3278d2c3---nosikuzofegelobikatubi.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/5c4cd9ddac17baa561fc91293e87be58/93037200467.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/5403e7eeec8a719344dd9579f293d5b5/raxoj.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16080cf8c03e78---fakurekaxuribavawubi.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e94f4192e1d8d86a151e6cada52218a3/62456879382.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd50670a0a9---89260608408.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/d361f9a54aaae12594f65e591127ee9f/84133565788.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=math+in+life
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/5d2689372a81a5c0ca927fc3bf0bf09b/tevamaxugamiposaniwa.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_off0000dd6a.bin
63d899b3f41632bc1dce8f0705b8029abcc6f459c2887a873b0194ad3ab4db2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 17008 bytes
font_01_sfnt_off00010972.bin
fe9ea4aab723ef28b934bec072dbdf8eac72fe71648948e135a214616d24c332
pdf-font-stream PDF embedded font (sfnt) at offset 0x10972 9916 bytes
font_02_sfnt_off00011f33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F33 16792 bytes