Malicious PDF — malware analysis report

Static analysis result for SHA-256 daebc3c6e3e1e0bf…

MALICIOUS

PDF

80.0 KB Created: 2021-07-18 14:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0db24fd52603cad4db7cbfa4bf24c0b4 SHA-1: b266df9b22c81074d92c30ef07d180316a254a38 SHA-256: daebc3c6e3e1e0bfd43faa363a4fff8098ded9f4240ba66e9f9ca8068cb38cfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a46eb9c7e2c---koxem.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/259bd94578e5c36fdc3344ee4910fcc0/32202835739.pdf
    • https://walnutcreekguide.com/wysiwygfiles/file/25711877012.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00fd16cb85---92132022850.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/be2560c321ad02b3c3a693cbd228ca70/webuxurawazibifanixof.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c1c0d0da5---92759578428.pdf
    • http://driver-jazda.pl/upload/file/wagokumorotuv.pdf
    • https://unosms.us/userfiles/file/lenabuvegepibesi.pdf
    • http://nyitotthaz.hu/userfiles/files/gelasuvebotitosuwos.pdf
    • http://animalscipublisher.com/files/upfiles/file/39217268877.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d74e7e7ad---bujilepadumoliwivipok.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d96ba2f8f---67463134121.pdf
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20471289510.pdf
    • http://feuerwehrobrigheim.de/upload/files/detugamuk.pdf
    • https://daquin-ferriere.fr/userfiles/file/75970376381.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aca766254b0---vopatosedowebufu.pdf
    • http://kurpinar.com/img/userfiles/files/24364684612.pdf
    • http://automsystem.com/UploadFile/file/20210510031636036.pdf
    • http://omni-links.com/images/blog//file/68469507133.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/hb1feadlh4rm29ja3jukmdabc4/92255904280.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/pmo2f9jpu7iprm5k8d8d6m8ee7/zitekuvosidupufukupugesa.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9241df4f368a71f7c41e03852d184498/saradedimejoxabul.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ab836b1f0a9---jiwavogewemunu.pdf
    • https://unosms.us/userfiles/file/53284496462.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=limits+and+continuity+mcq+with+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d270.bin
273524c17aa3d59f3cc9290d21773ff3d2d411d2cd3114482079248204effb68
pdf-font-stream PDF embedded font (sfnt) at offset 0xD270 10992 bytes
font_01_sfnt_off0000eba9.bin
8ce2af75023b371be3430e382a6a13ac0189262f7812b055d97b160841584087
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 17764 bytes
font_02_sfnt_off00011ab6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB6 16792 bytes