Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f494754d8de349…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 12:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a9d651d0f5ed3b4d161f6ac478e07fc SHA-1: 5210f2071af179cf8fa0089d8ba01b307c87b5de SHA-256: a8f494754d8de349823cfb0eba6922cbd05f9d37827cce338eface1cf1e5110f
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://lebo1977.com/clients/7/7f/7f96701a3ad848a090446b6ea7dc17b1/File/6036037464.pdf In PDF document text
    • https://newtop-eg.com/userfiles/file/rarutakibitareguvenaxi.pdfIn PDF document text
    • http://ezibra.pl/upload//file/rupik.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/88613676931.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/o91153rqnpse72k9bt7lep23il/xanimetupijowamadifiv.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/fubawepizegozumubo.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/nobejofawisoxapesuzatofo.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774e5b17466---34286446028.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/48914787344.pdfIn PDF document text
    • https://ferropula.hr/files/5795138862.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20230284953.pdfIn PDF document text
    • https://wodgluch-projekt.pl/userfiles/84874999600.pdfIn PDF document text
    • https://jjpremiers.com/files/54562827611.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/28166039980.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa20a87a6c---94000238538.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/8898209368.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/hmofvau2mqjgantq9vdp2hcbcb/talutafujeduxa.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e34e85e441bd0aa09cfc72a766d5a48f/rilujigijifazuromiretiso.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/a5d979a45eb510aaec0c1b87070a2c76/widupixedoridatimoruwiket.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/42571734227.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16108d70834a77---66464602537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=agriculture+colleges+in+karnataka+pdfPDF 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_off0000d3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 10968 bytes
SHA-256: 5b4784d73863368531ea55595ac0b82e540f941416fc9908c7bb4e409bb8b98b
font_02_sfnt_off00010556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 21068 bytes
SHA-256: 729d3dac520f8eca7c3abfa0dae2cb01709823d6f7838ccd71c0753d58b4b9c1

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