Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5586243fe01440…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 12:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 538cb1e05283a3d6fa3bbc2357e2cd2e SHA-1: 2776b555ff3d58547c1fa105a5dc85af864ec5e6 SHA-256: 3d5586243fe01440dc71f6804d2dfe48b2e035496a7718e4e6c24d8e05d685a5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm and pointing to compromised CMS upload storage, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection further support its malicious nature. The embedded URLs suggest the document's primary purpose is to lead users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=my+hero+academia+2+heroes+free PDF link annotation
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/8675945984fa2b2d40ea372112ce948b/tonis.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210906075042_1585742147.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/lebajipunezorujogo.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/279126021fe690cfe109429af9e73974/derimeniwirodojigofi.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/kudujizo.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/golubozusimotebe.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/3307825762.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210919_104858.pdfIn PDF document text
    • http://xsteelstock.com/d/files/99241791400.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/56574237723.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/5224247526.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/42592696311.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/35056120869.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/poxuke.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/16707748631.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/52759721821.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/22248362108.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/73122591661.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/pamuxiniledipur.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/damilixamibov.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614287a49c6ee---xevozivujirojejabisit.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/jeguwekexuwiraruke.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109100749367014.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_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 18348 bytes
SHA-256: 675e68e2431cb2d3764f5daa27b3bee8b1531550f226b853f59ba6c510eab665
font_02_sfnt_off000122bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BD 10720 bytes
SHA-256: 4dd8cad8743c832484d71b62ec30bdc30ce64bcf89e9e0a82f1d20403cf30432