Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e43850edcc2246…

MALICIOUS

PDF

100.5 KB Created: 2021-06-27 19:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5cd87eff9f419a538bd5f225540799e0 SHA-1: 985de95600d3e64c882b6c08a5790fd91424dce5 SHA-256: 33e43850edcc2246629ac6d53fa160f35b39a77751657119fd3ea05c04790bc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into clicking malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160708c137c8c8---darupipixuzajupof.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0ea00bfdb---38756949950.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/at6v5v83ndhd63591h7u9cvrq3/jasewovupasagufoxosakux.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf909ec021a---16936506660.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/dcb0f92aa6d6eba936c21663db4a6b57/26512401910.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///47425061693.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/432d746a9bc3fa7edbf2880b10f3a24b/92099468799.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/900e8b84a7e1cb54823770cab23520f8/13138115677.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/fifedilafofezabebugixepi.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/n4m2628dui1smch4gvs9mprov0/gepowovisagapek.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/fisigimigezepuliguxetunob.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/cc203114d772d0c4f2bb931bfd3e5626/vogejafumodul.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/a22f47fa92be487af1f211568a66d82c/46523352293.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d5ece92dd99e1bddab8de3b74fa3350e/finina.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/mrk2mh3s9mh7kn5l1keecmpi00/28813774603.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7a3e637ee---werujabuxopurefuguxet.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/26f09843dfd22c16e2d3211dbff6a421/zezugadedazulum.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4f6138386---85449052290.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/lakapobe.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/59187673728.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/93331672293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ept+reviewer+2020+with+answer+keyPDF 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_off00012569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12569 10768 bytes
SHA-256: 0772382ae65eea870e84ae0fd076b217eb132cd4fb94cf6a0126074843773ef9
font_01_sfnt_off00013e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4F 17716 bytes
SHA-256: d6afc42b29bb4bd693e020efcdbfb09198d56e827cddac88912c4366268b2099
font_02_sfnt_off00016cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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