Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f900a576170a7e0…

MALICIOUS

PDF

88.1 KB Created: 2021-06-27 03:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cc2e14f5a73369678b8c8503876caa3 SHA-1: 4654f401d9e14de8e0e6a15794d74e534930aa60 SHA-256: 3f900a576170a7e052be26a0a9315b6101c5db5d45e799a88deecec899dd1d32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The primary attack pattern involves luring users to click these links, which likely leads to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2349c10d9---nefufo.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079d259d25f3---44143486964.pdf
    • http://aldo-ins.com/userfiles/file/polalenu.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/cbc2d25ef352b4522648de22f4f71fea/loxefefazesutinedu.pdf
    • https://ludifrance.fr/userfiles/file/28730738281.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed2a08f152---71831426467.pdf
    • http://sutphinsgermanshepherds.com/clients/21958/File/zarulipeb.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/1g88aauopbndkjc8bjhr6l1cd6/gotowepekegukapabemuje.pdf
    • http://eko-inwest.eu/upload/file/roxejusoponaw.pdf
    • http://abwlargo.com/uploads/files/pegufexoluvadosugez.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/v5ci4tloeob6o2khvpknn1f7e3/18575696160.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb06475421---83209510578.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4ce953a2b9ef1f56d01254faae57df90/52892135198.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/2b06aec8141989a3e31f9f06daee3ff7/widapidokovobak.pdf
    • https://bd-sokolovska.eu/userfiles/file/zujofukamalorupuwofuxevu.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16073ccb90fb79---jimegujakukelixuv.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/pbqhrgvbdakephsbroj2iapmpn/gitomawogixopegozasukako.pdf
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48413865362.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/e72b1df229b601922f17f613fb773594/20325417963.pdf
    • http://reutlinger.pl/userfiles/file/xagisulufudakaku.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/053dc86f82c71d4e1968dbce44542fd2/xatoxopulesimovu.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737804af3d2---nenovonetixapexumuga.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb99e3d8e6---32861746558.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adffea5a057---56140100511.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=house+of+cards+bts+english
    • 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_off0000f5b6.bin
f26208bbd45fac1b3853a88eeaf088d1c8dbda3e27be2cd3fe3cf7836ae5dee8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 17064 bytes
font_01_sfnt_off000121da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121DA 16792 bytes
font_02_sfnt_off000139f1.bin
e775c44b2248d4f2522560f3f187d919a44a8866d793faac1d61264683ca9c76
pdf-font-stream PDF embedded font (sfnt) at offset 0x139F1 10984 bytes