Malicious PDF — malware analysis report

Static analysis result for SHA-256 95cbf068a9a2eb8a…

MALICIOUS

PDF

87.2 KB Created: 2021-07-08 01:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 22d04bf6b718dcbe2a3345610805adb5 SHA-1: 0d85f629e0b48af5f9249d0aa462a76f4d3564b6 SHA-256: 95cbf068a9a2eb8a79a76774331dee6468db7870c24e6e6a64bcd8155d72d018
196 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised websites, likely intended to host and distribute further malicious content. Heuristics indicate a link farm on disposable hosting and compromised WordPress uploads, suggesting a phishing or malware distribution scheme. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.tomasjelinek.com/img/pub/file/gagaxanudisu.pdf In PDF document text
    • http://seednseed.com/admin/fckfiles/file/zifedezavujomutufe.pdfIn PDF document text
    • http://stevis.cz/files/file/50989641411.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/texonu.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents//files/wuribivurutajulori.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609157f75bbfc---62644750910.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/41155080267.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/2hhjt12assea78k2smukpdood5/xekatidi.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98f544f52---33315936778.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/47250274697.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/vodapemakamusulaj.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/93390002539.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/a9127fd7e6d33bbbaf7ad05bcc8a2ac7/fafired.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/1929690622.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a451c569c2---fakuvepudewiwebepir.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/ranotozosadoniv.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/s0pgu07ifv3vltqe6vml5r9mp9/paved.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fee323cd1---20235030682.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/be790727a68738d5118e314504a260b5/94235312044.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/3968114833.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cb099621c3d8e86442d37f9494438ec4/mobubupozutezipejiwi.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/cc62ac66e9cba27b2178e3e5904c3e1e/63695784641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=low+side+ponytailPDF 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_off0000f4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 16732 bytes
SHA-256: 157060997162e766d83048d85c45469cd8f57f648042ed5c71b521c52a61b06e
font_01_sfnt_off00011ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF7 10440 bytes
SHA-256: 5aa26b2b811d5d8598e244d836f01a7e2dcfc70f33faaf31a2795e5c4a6d94e8
font_02_sfnt_off000137d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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