Malicious PDF — malware analysis report

Static analysis result for SHA-256 8934d0551699a506…

MALICIOUS

PDF

86.2 KB Created: 2021-06-27 00:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 61996096445718e17887069509c015b3 SHA-1: b50641dd42c827fdca0d9737cea504920d5b5a09 SHA-256: 8934d0551699a506539bd70bd805863811da649d988bcacbc579051279eaf87f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to compromised CMS uploads and disposable hosting, indicating an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://alexandraharris.com/clients/36054/File/badujudegewikep.pdf In PDF document text
    • https://rajatotogroup1.com/contents//files/xozevowuru.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/zebidimaratekenirojupisal.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/85804913587.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ca3fdb596---60038989535.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/24473596338.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/97432240975.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/b0c6b2b35eaeb46de9d2467ff6067a25/10806254736.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f415c567a8---35477511602.pdfIn PDF document text
    • http://multifamilyfoundation.org/clients/3/38/38c33163524538bb895552046de0b362/File/rafotaku.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/a64cm6f5fgil5sjcupu8452j05/fevowivufop.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/dewusebamekujiveg.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f448df2a02---daxiruv.pdfIn PDF document text
    • http://goref.ru/files/file/devanapubonozese.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4b71bf8e4---vebopalinoketovuvaxet.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca27ed3797---145917473.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/botusubozivetiwadugaw.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/parunogujibirubij.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/903b70bb392d913b02cd86be465b4fa9/tozidozisimavax.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608db95400b73---fadira.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/b0464bc141a046783fe6f441532daa36/71512703570.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/ruvosuxogibatotiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=electroplating+aluminum+with+copperPDF 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_off0000edb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB8 10824 bytes
SHA-256: 83226d8968ef49f5824760ea261699996f486f971c7906e34b9293dce345f1fe
font_01_sfnt_off00010682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 17152 bytes
SHA-256: fd80bbad99cce5b9beb3c39d85839ce43a915bf74875d5a9a6b5922c1e935310
font_02_sfnt_off0001337e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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