Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f140cefc11019a8…

MALICIOUS

PDF

88.5 KB Created: 2021-07-02 13:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12710d06e2b299098201fe9b698ef1f1 SHA-1: becc7b9ebfa434f17ecc4508df7f5c91d5b66a58 SHA-256: 4f140cefc11019a80ca58986261969ad2227de078a4a1f082ffdeb1c61dab475
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, a common technique for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns suggest the PDF is designed to lure users into clicking links that likely lead to further exploitation or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ty-universe.com/image/files/20210622_151212.pdf
    • https://zzarosiscarampola.it/file/16167485642.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778702581ef---nabikutosu.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/62047cbe6927b73254056f1de676dc2a/85860038145.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9b259bc99c73b3a41cc1c833f1b45bdb/lopixisupevowivoxis.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/54d7c615297165fb585c5955b2070b40/boguzanefowodotatefudere.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b4354597559---89418665263.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8264dea65---42500867966.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d87a8a5f97e---wagifadanituxukemopagufu.pdf
    • https://cafesca.mx/ckfinder/userfiles/files/lupisinijozezud.pdf
    • http://asesorgubernamental.com/images/file/49601313903.pdf
    • https://fl-forever.com/upfiles/editor/files/wirupamuxez.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a551d8af592---nikaxeguvevutolaxuzulazal.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d4a767f29---ridakanikuve.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a3c9ea6b6---pefowebikafu.pdf
    • https://samsungvrvklima.com/upload/ckfinder/files/8716331925.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072b6a8eaf02---dipivomogifoni.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/b45d445fe5614e6dbf4e8f720e629fc0/46042165872.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/gkvldhj0cefv5aik0kp7bv041e/16300273565.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66a499de8f---vupaburavekokurariz.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/vepojopexonunipewu.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904658993e5---9728625888.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f8d1957d91399297ac0db0abdf4a6eb6/wokob.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=test+case+example+for+manual+testing
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AE 16792 bytes
font_01_sfnt_off00010ec5.bin
bcdcec7f88a8ab880447b088e5982b5c14562c526fe9671df0abb41c6a08e5cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC5 10988 bytes
font_02_sfnt_off0001284a.bin
7d36cb20de5b417c257dbd6e074dfc64b7a3dac909e959864cf13786ea3ab953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1284A 17104 bytes

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