Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ca3d0fe18ee123…

MALICIOUS

PDF

76.4 KB Created: 2021-08-12 15:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64a5c8c35edf42fe8f759c6693871ac2 SHA-1: 96f6c2ce3df2e0ea14404e383f3d88855928deb8 SHA-256: 16ca3d0fe18ee123f6bac7fc88ccfe2a319b9ab332bcda1bb13cec2348f26d75
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection (Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0) and an ML classifier indicating maliciousness. The presence of embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites, strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or execution of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/q2ho68uabihtik03lfb2dra8a0/nitoxirotaxolu.pdf In PDF document text
    • http://csc0311.com/userfiles/file/20210626084625_4n1yjc.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/21000058157.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083dff5f3979---xugiremasuvajikarorikipod.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/zidowilonebidulol.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/99376037247.pdfIn PDF document text
    • https://altbuket.ru/files/pukoj.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/waveje.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/pipisimug.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/fu2q5ehqamvdap1ntdshlkd416/63770087787.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8e555c637---48770036639.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/gelunosozajixatogamo.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6aa3c7cf3a---31868744319.pdfIn PDF document text
    • http://fitviewer.de/files/file/zevipebaseze.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a17549d0e3---39345719643.pdfIn PDF document text
    • http://gapp.fr/medias/files/luvukeka.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/94858816601.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bff2ed69a---93592246795.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/3f91cef1f694be87d61eccf9ae2986f9/teduma.pdfIn PDF document text
    • http://toonesk.com/upload/22577469993.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d37b0e1197---1983891958.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/jesuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=harivarasanam+original+mp3+starmusiqPDF 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_off0000c76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76B 10940 bytes
SHA-256: 5b5765513ae920903dcd4bd167424ca9788c11b83a98723cc49e949a153086a1
font_01_sfnt_off0000e06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 16436 bytes
SHA-256: 79865c6da9d40a64e5f290d4550321300f81a03a54a2a9a6b79a0840931105bc

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