Malicious PDF — malware analysis report

Static analysis result for SHA-256 104305752d6b1227…

MALICIOUS

PDF

69.9 KB Created: 2021-09-03 07:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ea3b411913056348f44c333723371807 SHA-1: 2ebab0fb0038b4edd133e808179905e49567283a SHA-256: 104305752d6b1227b8af176d80880aa742a0e55afd9ae11890a61ff330f552bd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting an attempt to host or redirect to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the suspicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://engroupe.ca/aym_image/files/vurowuxifiribuvuga.pdf In PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/68cd92afce8c09351ac4744b73e66326/jibozevewarixosekubanale.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a2cd7bc36---dedokijixivur.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/turavovejekas.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/jafilanugej.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/965d84d5f0533b97b6148e8b39a30802/tobumubasa.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/32929111658.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/5da220ada8fc1634617078ec94128b1b/9179501151.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5225d06c2---saritarezepuxokesaxuxi.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/nesb0vngo00jbggvcprt2c8nc0/72662022951.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fce090c7a---mevubofuxopup.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/gasevijavajame.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/xusitefokavutareki.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44609542685.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/32uqpiltbb0ocappqf3qss30c2/zuminoxirilafinotoj.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/5937e81c85b89161e15139ec963c613c/80207740886.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/wopoxemewad.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/momagipi.pdfIn PDF document text
    • http://mayjack.com/upload/files/97974465307.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/gozanitadefowowazebolid.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/vafovonorilagiwar.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d661e462ea---renerub.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/13873052149.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/53227485630.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/d3vqgdg9jqk6ffs4m925h8grju/42248729158.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ukiq3141snepu91ou9ir1r5ntb/sapux.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/74992971399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ncdeq+bmp+manualPDF 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_off0000b58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9D 15020 bytes
SHA-256: bbc577e80770def3d99ce9e1a7107231f6860c81af8c75d28755b6e7c3cb83d3
font_02_sfnt_off0000f30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 10460 bytes
SHA-256: cd7b52cc166e04deee439ac8382398528d9f0ca85eab5d36828e5475566bb7ab

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