Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4432362ee85d10…

MALICIOUS

PDF

77.7 KB Created: 2021-08-17 12:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b6fc917f9f9a365c149bd228eb16e63 SHA-1: f421536fd15e9371c2eaaab2338b30656a4ca7fa SHA-256: 6f4432362ee85d1097d7c35e088aa23b23255b3e902cb9e11e6c05f3cd735a1a
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to domains that are either compromised or appear to be disposable, suggesting an attempt to lure users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://anquocrealty.com/uploads/image/files/davugivuginejofu.pdf In PDF document text
    • http://hondasushi.com/uploads/files/10904550952.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/81131039317.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/3900101401.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608768330d815---tamepujediw.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2872dd9ee0---nolize.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210811062806.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/29l5p6pgmf874is17a8u1bl3nm/53306368165.pdfIn PDF document text
    • http://yjccnc.com/upload/files/xokuwesiworaf.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/bozogeb.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/fakamivisepemelemov.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc1f68f6d---pufol.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/zarigupexitefopupibi.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/gixosubebubi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/a8pudealbslushkqnojdm56gep/xerojenizurutirewofenis.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7c7d5ee6c---60425059662.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/95090795201.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/4imhlh5ueuk8je5jouck97lktq/suvilejobumegugubupux.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/86a4aca84c499fc4947d802ab996b1ba/wofamuvinudozuxosuvux.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/7e8c01de64d54bdc93fc672b5644d84b/jomepup.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/sivugow.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/46d44329729582a2b5ff370c4e2c2c61/baduramar.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/xijodaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=design+and+analysis+of+experiments+7ePDF 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_off0000ca6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6D 11108 bytes
SHA-256: 07aa070b26f32bbdcbe727834794851124b22580203ff4ae83edac9c1914ccc3
font_01_sfnt_off0000e43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4D 17080 bytes
SHA-256: 05955814e2ce0c903840e693635fc5b23467a0fd7eaa27487ca668eb7f9986eb

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