Malicious PDF — malware analysis report

Static analysis result for SHA-256 101a9b604492c1fd…

MALICIOUS

PDF

82.3 KB Created: 2021-08-29 13:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e16ae530410632b420d90c17ff12025c SHA-1: b4e03f3721e8b15077815ac75728a2467e95e895 SHA-256: 101a9b604492c1fdca4f2f812b9f19edcce97d51c23c95d4c07248363372272b
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links pointing to websites hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/761b18e76a72c7da62c00be0ebf8091d/46498286467.pdf In PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/e173123d4b6e87c4dfdc90d88bf766bd/tegid.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/75699097083.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/dovobuzuxosegufewusok.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/lirozov.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/25053101172.pdfIn PDF document text
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/mevutuni.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/vuzufaz.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/80773350146.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/ad67f846012bcc67eb6a92a82e22e360/zonudazot.pdfIn PDF document text
    • http://koddous.com/userfiles/file/ridinagoxadewujobezubev.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3c1f53cbe9dee47f5d36e4903f916b14/fadutas.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/bf414a503e56829e401dcdf3a86242b6/bonevabejejebudi.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/47b19df20b9445a350f88302af53c528/bilufatopavuvufifotuxevel.pdfIn PDF document text
    • https://luminex.pl/upload/file/kazulenonej.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/cac207d880f563336d94741b2a1d4cfc/96290638514.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/85639236114.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/gelafomesajezoji.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/renagulibitozisisadefo.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ed1918817---27176901797.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/tuwinaxogiz.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/9438615523.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/77681728844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=importance+of+social+action+in+social+workPDF 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_off0000dc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 10772 bytes
SHA-256: dd16d6b3b87a1dbf00cd08396df5c5e0a51b0c8a2dd1106aa7d48b2dde305a4b
font_02_sfnt_off00010d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5D 18132 bytes
SHA-256: 86e569b16515f11642f59205d0df83a00a03d7f1ffab731332e43a09e38b3be8

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