Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26ac1c83c997c03…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 10:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f7a51f0280ba1ee53c11eac3f41c094a SHA-1: c79f72dc9413a66fe847efa4d32f48fa20c93e6b SHA-256: b26ac1c83c997c03e092c3c3440d4d660072b7847f7f39d4a9d24e4e1e616109
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful external resources.

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://krisoc.ru/uplcv?utm_term=these+old+shades+georgette+heyer+pdf PDF link annotation
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/65624760585.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/n015vkv7ptbmhr304fjr2210b0/rulazetoxaf.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/totijegazawirawenid.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/45ae754fa44a2cffeafeaf57351ef3a7/mojinezesibebuloju.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/kufabo.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/32038013685.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/zomopowumelubelawiputepu.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/77515699620.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ruo0v63giq8cd25gi314mtk237/16817324241.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f106ec3970---58065869594.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/404119256.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/3bd0514034da1fe30a977eb87d76c29d/vimuwunodizirux.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/q9fj8uqh866qt5dd5jv7jdmje7/gekesupij.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/noxutenexurepok.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/8fb0ef954c904980cd713714253c361f/69193596857.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/36379264334.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/vuxufujugobeja.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/ratupobibuwumidapawi.pdfIn PDF document text
    • http://gawhs80.com/clients/873705/File/tebolelerovoweg.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/nulazofufufegazazulawefu.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/op50fb1ld4a4mhe55ote15s8i7/77699127363.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/nukitaguvodifojejazax.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/87847525686.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052208140816.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/ejt26oo3954h075k9auimqcp01/47089846106.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_off0000e031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 18912 bytes
SHA-256: 61376e522bb692973c35b4f317d7f4a3dd487548719acb022d50f0e5a14d972d
font_01_sfnt_off000110c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E0 10660 bytes
SHA-256: 8593ea215afb52e47d15e7bb119e072934589f3d3e892618a5ce833db3525508

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