Malicious PDF — malware analysis report

Static analysis result for SHA-256 8886d98d28e5b2db…

MALICIOUS

PDF

94.1 KB Created: 2021-07-08 09:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: efa534678536e6e82cf409365893cb06 SHA-1: 62925b2780d50539d946283ef92938af8624e295 SHA-256: 8886d98d28e5b2dbf0b80c1538728ac0ff90c8e4251cba749860a7534fef6798
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://keitbg.com/images/files/41832298919.pdf In PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/3d442385345a485ae3d00a6b5c35ea52/74449016954.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/wamafeku.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16092c71536967---jamapibugipikebateb.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/1m06470o3cfgc253dfrrvuors2/mujadagor.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/dojajupojobi.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/d7c44b65227c54cde6184c47ca4e7f37/modifab.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/80ae40aecd30f6b6a65ba7cbcd446d7d/dinodo.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7e0242c66---sufafopetavadopaw.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a39f9c84c27---86605549001.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/nesidaxubapedumifimov.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160767be3bf6d8---dilib.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a77bebabb814885fa87dd9f78771ed4e/zatokoxalaf.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/kemewusetaw.pdfIn PDF document text
    • https://aokman-drive.com/d/files/didezewudaledube.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/zozukixolugezuzo.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/5022035d2d74abd15d896145681b4833/vivotudoribezenadudeveko.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a992e01d065---tujokuluxovapunit.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/7bfd0e6b42a5ef25912dadaffb9c1539/96560063851.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/85344997875.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2122461416---jibet.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/9bf5380b9f1acd3401e6e09ccaf77ba7/zajis.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/68810447880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dogs+and+cats+similarities+and+differencesPDF 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_off00010d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 17352 bytes
SHA-256: 34e47c8c1d9e83f67dd972eff6aa1fd76a78ef72ccbfc744cff10a2eac539df8
font_01_sfnt_off00013a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15235 10820 bytes
SHA-256: a1da1e07db08cb555a832aaa7236b7cbd9c9076dd31c597858a2c0242ed330c7

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