Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da37b3c6005b7ed…

MALICIOUS

PDF

110.9 KB Created: 2021-06-30 16:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f43046361d4c99097b7854563a1d6960 SHA-1: b9750bd6e55fced7e6d20a342a03326a12494976 SHA-256: 5da37b3c6005b7ede502ed7473e5195a02b0566a81ca201606e58883e70ad60e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites or other potentially malicious hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078f835925cc---xaletezuvobolulusoralu.pdf In PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/kawoxalomuguze.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/maremibaboxonuze.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/kiwefobekidarol.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b464a909e---24782598958.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7bb2bc2ee7f4cb6c643b74eb76442011/madofewosiwibugabemu.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021051314142470554.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbead123a3---91577788001.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1623018247.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/70880085740.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/f35d6cb69ec838152a21e191a6044635/57466805222.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bab55c120f1---mevom.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160855f1fd951f---94065132975.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cb31d00ff3d4e0127e349691622492c8/39737570077.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8282acf6103851d8be9fc6eb66cd4608/58601956322.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/gerivexifuna.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5710c253862c6788b52121cf06532777/jipatedilenisunuxo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/nemebajos.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/88440176699.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/88492884498.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/8dd7f33a829bad565a8bb0319e63d457/94185233623.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/zatadulexoj.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba67e1491df---66113832367.pdfIn PDF document text
    • https://wittnebel.dk/file/bivipalakegazebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=bowser%27s+fury+new+charactersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F54 18236 bytes
SHA-256: 6cca613fde996f75b5bb41936156966f3bb9326eee02b7a202274d549aa581dd
font_01_sfnt_off00016ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000186d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186D3 3572 bytes
SHA-256: 5dd0d530849633ece30a2b33cd6c7c3abd3d9839ff0efa8c602ff8969a49314e
font_03_sfnt_off00019518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19518 10680 bytes
SHA-256: 299711d0c8da1f7551618c6964ef62a65eca07d96708d00036d20a13a2a286d8

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