Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf783c75cc901806…

MALICIOUS

PDF

75.2 KB Created: 2021-06-20 03:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 491dfd58d661142b88b64ec815ac4322 SHA-1: 2b86344c165939230dbe0164b36f1eacf826bbd1 SHA-256: cf783c75cc9018066e6d52ab4720a3a1feabd8dd1f42b2dabac4deac2776dbd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm designed to redirect users to potentially malicious websites, masquerading as a source for unblocked streaming services. Heuristics indicate the PDF is a link farm on compromised CMS uploads, and ClamAV detected it as Pdf.Phishing.Trojan. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://studiopros.com/userfiles/file/ In PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0c4f7fb53---siwedesiz.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/tawukanajiros.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/5b09eba1a51573d5fb011331c7a8a640/92821908392.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/83508979215.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/90576213659.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16086b9c5b6119---95915240387.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/vativufaj.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5a63673fb---43113557773.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160906f4790e71---kaxetasudonimuwiboviwolav.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2b7c85346---zigiradukodimomasusa.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/864df6pu4rr4brfhae5cbtnme5/fizozidobesor.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/xokevegemad.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/001b08f9d0429ca70c4bd5dfa9c79315/66367648321.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942b39b3be7---8897467221.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/bowifirif.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/926eaf40a5d01dc9b3bacedd33fbc684/58299605194.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adbcb07ef3d---20100273796.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=123movies+unblocked+websitesPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72A 5388 bytes
SHA-256: b35838ca77a266692f0b57b0c7568b3adfc25b5c9f3cacf756f306a8616e6a00
font_01_sfnt_off0000f989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 10708 bytes
SHA-256: f1a3b7dae365a46399f174ff6d209dada5e2777ebc3d0e59ca57b149cbd99781