Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c984d03baa194e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 06:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cf04de45c0a864e48d8be78e91b82eb1 SHA-1: 24110a2472bb7de7ae5bb4f50743cb9a4f2d9b87 SHA-256: 70c984d03baa194eea2277257ebf992e4d77bc4d02f93354f188ba380ad84051
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://dorapeyzaj.com/userfiles/file/6671749561.pdf In PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/16661066137.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/fowidavijeropixenojepivok.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/1ask6es607od5lmbli3a7u3if9/79096928659.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/18780101001.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/3b5bafd34e531dbe3c5b5dc23dee52ba/getalonugaralorixog.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/japaxavubonilofozudeli.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/bufesidemevuroluko.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/68020688581.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/xorogu.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/dakuzaxukoxupetuse.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136cb9b86cd6---77741164526.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078819c9cd08---mugudugigepatet.pdfIn PDF document text
    • https://allianztc.ro/files/file/fuludetadonevofijenevi.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/wemazebujivujaxafivadina.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/59ae05a114a3959f55f3cfacd52e0e15/zuwitazurajuxijerexus.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/59887708168.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/vibuzifukekafalo.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/joderaro.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/35262919633.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16132e4cc379eb---kekobizazisibunalopo.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90294772648.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa40c8986f4---sexolusiduranagamudamisit.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a207c1773---84840418499.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160baefbea5e83---52117962288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=bruchrechnen+addition+und+subtraktion+pdfPDF 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_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 19860 bytes
SHA-256: a3d6a6a0bdcc7819ed1a6459b926cccde537b8db6d218c368066c7e772f072fb
font_01_sfnt_off00010a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B0 11056 bytes
SHA-256: c61e23b6b7ab01e825db43db4f5fe4a80ed224160238a89f045030ad3b45d3ff