Malicious PDF — malware analysis report

Static analysis result for SHA-256 958c4a742680f456…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 10:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a9ad854869142b40f13e1dae5df93f0 SHA-1: 79f519dae2e9953fec277fa081ff22c34987e304 SHA-256: 958c4a742680f4567841167f4c2f2fd0840b7beb9655f98225cfb21febb58d95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites, increasing the risk of further compromise. The presence of multiple external links and the detection as a trojan suggest an attempt to lead the user to malicious content or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/529f2593a989a7295fa356df5521bb72/2544353226.pdf In PDF document text
    • http://ahlhy.com/uploads/file/011005167956.pdfIn PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/nejezunogemavizikanuvep.pdfIn PDF document text
    • https://proxus.nl/file/80818341652.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/xawisevevovarazewogu.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/31667399841.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/1taa1ciid63um4gld1amfmjatm/ledas.pdfIn PDF document text
    • https://thietbigas.net/media/files/31771426780.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/e7uk2u83fgf3ufeg74ibbu4ca9/dufojipiguxajajaga.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f12cfd57c90---wobudidapaju.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/kosoganifarekemivezafika.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e386e409a261378baf5b3b3f08a8c09f/70363193458.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/ff38d29c24c9c0d961e295943511b171/wazujalipetixugava.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/5c98544ad6a2bb0d901fe83baf2cc635/sajefatetabixunexejem.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/h76cgta863pd75ccfkr89t49mg/kivikavokexu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5645tll28p7bcg5lq5l4d3hs54/37195756804.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a252d82559---57495354194.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/bevapa.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/binovikafubi.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/kifevofuwewesi.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/09f96b2718383441f6276bb582f9c26a/mezavimoxoxiruzux.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/bilemutijomu.pdfIn PDF document text
    • http://cartopack.com/Images/file/19742938900.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/17769992816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=business+english+pdf+testPDF 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_off0000d7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 10548 bytes
SHA-256: 7dc909c5c69602c66750a92fba96a159d20c30c98307fc81d6cabff3ab23def9
font_02_sfnt_off000107ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AD 18128 bytes
SHA-256: d57d4296ec7730681a257ee121ddd0181d4f55295e8e6b17ee304f1079467d7d

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