Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c67404fa280c2f…

MALICIOUS

PDF

102.6 KB Created: 2021-05-27 15:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4da79b668bca79fe69c7bcfb564e4017 SHA-1: b70ded8a13f12869584f6cba02204ef610449f34 SHA-256: f4c67404fa280c2f4424b4316f05466f18a6f03034fb3aba6a0b0c05267058c5
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

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://allytemp.ru/uplcv?utm_term=dna+test+review+answer+key
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44dbd9af56---50011768998.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/5941b67ebd2903bb5770bd1906577e20/16097366874.pdf
    • http://akcjonariusz.com/UserFiles/file/kipudorumef.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/g83g650gand1qc5q2re0hinuef/61803316700.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607230250c4fd---xezegowumedesipe.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/07dc11fe3f9d2e120a5251d5eddf1a1c/40625156981.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607203f545e0f---55297952850.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160801deb255c2---71105968917.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/91d505847ca5668e00bfee8cd0b7059b/12136284584.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083118631b34---piloxemuxobawipe.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6b709fcc3---34160859220.pdf
    • http://asustainable.com/global/file/91978784697.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/d7iagfhio3dc2vhcjukenm77f2/kobawedi.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/93d68b5c4ee5246fa49f5bb66fa5eae6/83569154758.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608893f2e1eef---90525051514.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160739e1dedd96---sizodutox.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/39c86fabb10aa70da9c7ce94408eb334/99893529010.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099aa5e9e056---xebiroxireruvovexatibawi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • 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_off00013fb2.bin
c1f19ee1bfe1b33acb28b48259ed67c961fd775013091fd2be364f36468c36f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB2 4964 bytes
font_01_sfnt_off000150c8.bin
9880aaa8bd8b55ad7bb812d89ae2863a14428322d233296fd8d3fe62f8e15f20
pdf-font-stream PDF embedded font (sfnt) at offset 0x150C8 11772 bytes
font_02_sfnt_off00017874.bin
5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330
pdf-font-stream PDF embedded font (sfnt) at offset 0x17874 16060 bytes