Malicious PDF — malware analysis report

Static analysis result for SHA-256 4295a388a0f9c715…

MALICIOUS

PDF

72.6 KB Created: 2021-09-06 14:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 152659a0fb2034e170607b2ac4830531 SHA-1: f56bae9f9f2560fcb39492e534d763c51c675193 SHA-256: 4295a388a0f9c7157ced471bd06621c39bb4f02bdb8daeb8e23d6451fc45cd9b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or phishing lures, such as the one found at 'https://medvor.ru/uplcv?utm_term=job+application+letter+pdf+example'. The presence of multiple links to disposable hosting and compromised CMS upload storage further supports its use in distributing malicious content or conducting phishing campaigns.

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 https://medvor.ru/uplcv?utm_term=job+application+letter+pdf+example PDF link annotation
    • http://nm-union.ru/ckfinder/userfiles/files/46207396112.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/norifugugepife.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c58a077b972e453c937a978a21066e92/20856781820.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210813074118.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072598c7f737---66291575849.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/53721322872.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/gunudaxutabebew.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ljeb6fl37njsi64srieq7fo3g1/geman.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/98658479007.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/381047e219ed6052760ae4e023993ad5/zadufimewawexile.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/42947952167.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/19890607000.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b0ea563a7---94038897610.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804021dc830---ruvinodipuxopuwevesozix.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/pabubimovixafekuzuzebaz.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7c3051915db931226c699865ccd01743/wabiwiwigofejijexu.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/toregabujefudowuzew.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/56501833770.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/m1l5i4m2esehm9ig9mutjcjpu1/78501619501.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/xugelowewo.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c952606f5f---lujuxatuko.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/pututavopusata.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/etmcdhpvrmh40d0du2mc9nnvp1/bufilatofubulagej.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_off0000bbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDD 15664 bytes
SHA-256: 6c5e1f45662d40b156d0b1444675e606bd33328c2c4a14821c015cb8d5bd1d67
font_01_sfnt_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9F 10848 bytes
SHA-256: e0dd9de5e7b6103dde31453844894072eb6ac8fba5622127f85a3f5f81139839

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