Malicious PDF — malware analysis report

Static analysis result for SHA-256 481dad8472898c53…

MALICIOUS

PDF

97.6 KB Created: 2021-07-19 15:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b4e813cb37475c4c21965f421e18ef90 SHA-1: e45b2203c769b259a6905128a2aefdab5d6faa7b SHA-256: 481dad8472898c534c116d4015d507993c748e1121191162e3bc48b097b3e7ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or malware distribution attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096455b4acff---xuvebinozubop.pdf In PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/d7b7cl2sobbmukjh16as0gok67/boxawebefebivenuxufuvi.pdfIn PDF document text
    • http://myphamasia.net/upload/files/fibuf.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/85569021893.pdfIn PDF document text
    • http://bjjiffy.com/upload/wepimowosimanawukigexum.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ac73c0430---najotivam.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079b0eb4ba99---92139414216.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9nlqdruatq89aa1oeeqq3rdm1t/98144222665.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/58448947949.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a54d33bba8e---9250786949.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073c8dcb05a1---zikize.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/3e766f2f4418ac86cefcfa90dc2f7080/11000282108.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/99c367ed47f260e05d223f382aa04ee6/dopogewemudave.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/61ba57e60e76cb6180edd9df3f047056/vuvix.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160869af6c7499---xugunaluwiverajizamu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jch0ikdnerj328kpt94urcuuc6/titejixi.pdfIn PDF document text
    • http://minerva-collection.net/files/files/nilisim.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/tofh48u4hii7dnafm4kuqg00le/80055374276.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/g1fr85enfst75dpncqv9jrftb3/18658176374.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a46a419ea6e453a28b0f877f6f93e838/23091478741.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/29726a4b784e12de267ce2f881fba066/tiloxavusewisopalak.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/tfb7048p5u1rotguadbrjv8ou6/96040935637.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/eb5f37b09bb146d954617e923611f9e8/10927993317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=campbell+neuropsychological+servicesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B42 11176 bytes
SHA-256: 480562dd0c513a7ed90b92640096ad3ab645f1c986870599cd12a73cd3e2ea09
font_01_sfnt_off000134f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F9 16984 bytes
SHA-256: 6bcebf4a9f065cbaf4ab11c80151423e5e0291d1ac53eee35456681988155d0c
font_02_sfnt_off00016108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.