Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60c516b571d51d2…

MALICIOUS

PDF

81.8 KB Created: 2021-08-19 22:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bdfcce5edc08d90450f8d33d4a4833a5 SHA-1: 731732e1e9d118e727a1826877f1a181cfcd0137 SHA-256: a60c516b571d51d239fcc34623a9c8357abcf7938351ebccc16eeb710a05eab9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://crysiq.ru/uplcv?utm_term=what+are+the+flavors+of+snapple PDF link annotation
    • https://betamachinery.sa/other_files/File/motofugorer.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a71af45bfaf9f382c2ebfa1831bd6e39/ziwup.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f3919280c44---48364723063.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/sitetasanegogatuwuruj.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/sodfcv9l7c17otdikp021i8umt/finodezozijox.pdfIn PDF document text
    • http://intersonik.eu/upload/files/39772667733.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/xoraxuvexanid.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160e4bb43a5cee---vixesidemazeleburotorofep.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b59df056095b6cf01c520bcb94b1084e/moxaniguw.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/28357319830.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607927c3b80cc---mowekumawevutuwij.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f02f81ddccd---raxupalolu.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/43780698503.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41d3dea2e9---79295821973.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/p3g1grdl0l5jtfv570oomaq67k/35483522713.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/dosove.pdfIn PDF document text
    • https://aromamarketing.md/img/files/4320369118.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161172e2d132c0---desubekupibipofivarasupe.pdfIn PDF document text
    • http://suurelepa.ee/data/file/2854139409.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47d26cc219---46616375460.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/rumowajeboserefaxesejudox.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/lexuguvilagomugos.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/zumemotizemukativir.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/43419062769.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c4d4ae5f31b8248ade08a3b069b19cc8/muxoforojubokamesuzeput.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/wafowaniwojumanenafiviri.pdfIn PDF document text
    • 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_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 10420 bytes
SHA-256: 43dc4a306c70162a59e6eb4effdfb0c82c50fef178aaef7038276eb160697c61
font_01_sfnt_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 17676 bytes
SHA-256: a1bf88bd34ce7010497c93c168342d588b4dd7b0f4354a6651fd7278b5d77558
font_02_sfnt_off00012158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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