Malicious PDF — malware analysis report

Static analysis result for SHA-256 d827d55bed78e7ad…

MALICIOUS

PDF

114.8 KB Created: 2021-09-04 14:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c70c1182e2d0f0f347b3ab444af2670c SHA-1: df440ed828e197593e8d3d03a5100ecbcfce2137 SHA-256: d827d55bed78e7ad6bc672817f1c18caba0fb73db9d68189895d2147a8afa6d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=stm32f767zi+reference+manual PDF link annotation
    • http://africareview.in/userfiles/file/gimosuwosowujapoxis.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2231cf99f---zogadisipobezizezivafugoz.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/6c32c9f7447aea8d2864e8a556a3f111/30197315807.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210904_045853.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/14112013451.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/76449515094.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/xetuwigefixubujuxo.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/kimeru.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/2891837b0169e6e79798bfc1de274973/lazanepigekomosumuka.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/22275154583.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/fivokajikojobub.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ebd41dbb0---43243420869.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/93234479372.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/topuzidenojiwamabelareju.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/eebd0ef4573873971d2a722519fb17f2/49603291919.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/87288224955.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c5a618c36---39480646344.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/dawobapum.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/93855996963.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/vowepirenajonu.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/12990922814.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a33e97ed5e---88597172449.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/638022209610aba8079324.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ejcd0753s1jbk7c22b5p45mtl0/67137727252.pdfIn PDF document text
    • 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_off00015b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B7F 10952 bytes
SHA-256: 7f4cb2ba3683ee7fb0dd737a3c6c877c60d088da0c1f67b71c3332a8ffedd8dd
font_01_sfnt_off00017507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17507 18640 bytes
SHA-256: 2b55e17282701360075c443bcb23202bdd71ef6f2de4f8bd1e7a8b25f6828067
font_02_sfnt_off0001a595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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