Malicious PDF — malware analysis report

Static analysis result for SHA-256 a422b4df849050c6…

MALICIOUS

PDF

76.3 KB Created: 2021-08-20 12:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 375eec3a55aee26d8f9d8efc3f9a7b72 SHA-1: ca2e18568afdc85c33f96a7a66c71737647ef87b SHA-256: a422b4df849050c63b3c4488f8cb12fcfc36295c1699080e87efe38eaf5bf6fe
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress installations and disposable hosting domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/h59v6sujsj9ofk615gdqnooha1/wuleregoxiju.pdf In PDF document text
    • https://fulzugaskozpont.hu/files/besogebi.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/38438166763.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1816aee87---22426196376.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/35116290119.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021080204001673499.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/sisem.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/wuxorob.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e35f83d4d---puvifexenowoz.pdfIn PDF document text
    • https://toocapen.com/files/tudodibelozotokoze.pdfIn PDF document text
    • https://birudongker.com/contents//files/noxupojekaragolage.pdfIn PDF document text
    • http://altinay-law.com/images/file/viwapegosejutopas.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81335b1e97---nonoxarovasawiritonadu.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/1308919416.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f23443b1cc5---mimigukepeninini.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df987d2146b---ziboguf.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/98997317927.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/49093ec8e689679487c18cf24b543d6c/10095956206.pdfIn PDF document text
    • https://computerzone.pk/file/mozudixiratojukaburat.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/tisemeraxalevagoluwe.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/gisowudosisorix.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/kapavik.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/4092909725.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/27cdc57389878a354682d09e1091b156/88381173889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=biogeochemical+cycles+webquest+worksheet+answersPDF 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_off0000c92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92E 15608 bytes
SHA-256: 6434f1db74472fad10c72a4d7e032c02f7e13b76cc64f0348ca45cf97b094943
font_01_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 11408 bytes
SHA-256: bcdbe4860b4eb4e07aa7269825cfc8b510fe33fb7c2648aa6a33ccf640f8e0d4

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