Malicious PDF — malware analysis report

Static analysis result for SHA-256 2092b9a2b2fa9104…

MALICIOUS

PDF

86.9 KB Created: 2021-07-01 17:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4a362aa05effd41de866137ea9cc85a4 SHA-1: 6e866856a8ef86d1620851fc56537330f4467813 SHA-256: 2092b9a2b2fa910466ce56dfc7c93eb4a0b8419e9583e8d6f79d1a3813887404
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload locations and other disposable hosting sites. The embedded URLs, such as 'https://krisoc.ru/uplcv?utm_term=tenses+exercises+for+class+9+icse+with+answers', are likely used to distribute phishing content or further malware. No scripts were extracted, but the PDF structure itself is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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=tenses+exercises+for+class+9+icse+with+answers PDF link annotation
    • http://babywagen24.de/userfiles/file/nowigimagu.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160818ef8f280d---famopeduwibozufigunur.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160adf82acd682---5905261691.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c25dcdc43---gesalisizapu.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/1708472521.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a01d69864b---wilurizorakiloda.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1631269fed---suzave.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cabfe0b96f3---budibiwixap.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/riferovozapizibow.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/jorabosolo.pdfIn PDF document text
    • http://billsky.ee/files/file/20007137733.pdfIn PDF document text
    • http://hydrem.ru/images/file/kepisaji.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a694e24ad12---rixoruvepo.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/19463743100.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9584f8e6c55cbe20c3c3164c0fd7a22e/zovumatapupeboxikekuragov.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6bf5846fea12a28cb2da5590c89adde5/53626015044.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ac93bfd95263dca54313d3c409e4800d/jobudonagajafofajegi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b14fb245cba---13197582069.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/bbe6421936852473428187b528e52b87/4250831544.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b004138e5---15640881951.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/finojofonujivof.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/1338420081.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_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 10752 bytes
SHA-256: b7a869e128cd8f112acf71ee627837fee43f46bf5bb96f1e940409133d51a91d
font_01_sfnt_off000108ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EA 17380 bytes
SHA-256: eccaf90a995adac420256d5f67205dcbb5be7cb28c8fc8479cb7bc903296c965
font_02_sfnt_off00013600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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