Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b2f8baf6d71092…

MALICIOUS

PDF

75.7 KB Created: 2021-06-27 11:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3f935783415ece3f979bd82a1b7a639 SHA-1: c3ca338800e93eea521fbc5b29c2ed4805f7a013 SHA-256: c0b2f8baf6d71092904f6d5d3cfe739ce757e3015419f1e2432eae46a37d3c3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://allytemp.ru/uplcv?utm_term=3+sheets+bar+and+grill
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609283bc3339e---xamisepetidajukifibuju.pdf
    • http://lsbwg.com/ckfinder/userfiles/files/20210624/0932167332.pdf
    • http://gayaarchi.com/userfiles/file/20210529123254.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb1950669b---xuwejutitilojisuwatili.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/6kcvffvuajge5g56abhmk5s7d3/16913537761.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/p2q6nkp6b8ajachmg3m7hfu100/17953885460.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/9s5cnstatrp8j2d3h7jf5bgbv3/57389382368.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160804e7dc0bd6---65440306529.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e7abbac46---75274722225.pdf
    • http://graphicyazd.com/ckfinder/userfiles/files/refezajuguk.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e13acbee6---27481685570.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/9c18bf0fc4489408281927f7f1a61343/wekogiwapafefifisineluw.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae4909d15c---61495302509.pdf
    • https://iamtimeshare.com/userfiles/file/31788802176.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713c790b10f---31271653352.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/7eb349b68a3f6af5d6455ebb87fbebdb/forikufugiso.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/f86cc70dd6220f0d3edf0d72326d8850/vinikexujudififomus.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/1dbca49f9ec90f6bc19961f48bf31e1f/33822485999.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160955a111d033---75235281843.pdf
    • http://aelma.com/sites/default/userfiles/file/fojosegafejoj.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcc57671bc---fivigexadetexaniwi.pdf
    • http://studiocalcinoni.com/userfiles/files/16127561405.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5976ac6953---medepesilibokisemonukux.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fb259f00e---vemodugiwuwesilugodola.pdf
    • http://irk-yoga.ru/upload/files/dexamumukomitapebojosagid.pdf
    • 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_off0000c5a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A0 16792 bytes
font_01_sfnt_off0000ddb7.bin
90393df1dc8c30c284c58070fa06592e140f2392ae88b70236e1a41a3d235e31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 10620 bytes
font_02_sfnt_off0000f5af.bin
b5f6b3efed2893ec8cf8fc7c0fa585640a3f1593c2e7b8f1a5fe7ec5c1a8e65b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 16780 bytes

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