Malicious PDF — malware analysis report

Static analysis result for SHA-256 d67438aa4372673f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 18:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b7f0fc9e33f9da5164e74e968087f391 SHA-1: 28c92e6a88ec2e459e73e383fe65edea36eddf7f SHA-256: d67438aa4372673fa321f69bd2ec9a204ed3767235e9799efc92f79103d13fea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/638ffbf227512d33c6e9d1fdf988545b/83005797777.pdf In PDF document text
    • http://noithattamphuong.com/upload/files/6726481930.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/tumakexarato.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/49632974320.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/76333134225.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/71050858787.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/roziwegupisebuwoloz.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/rifen.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/75720000245.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66601040343.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/06c7328467b728b74e270a67bef23a7b/vuxojalesufag.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/9266999422.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/98943276781.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5517c0b70e37ee10afd031ad457fdb06/94811421563.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393347a705c---riwejigigojuwikivotox.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26844071230.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/44424675365.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/64929424466.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/vuzinifomo.pdfIn PDF document text
    • http://effektfilm.de/files/file/37993569588.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/54971013834.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/wadurigapalozafev.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/darikexidijomuzuvukone.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/haf5mbr7avi90qvepk8jc3vs97/75387566205.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369b125b0e0---89280183290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+hide+a+photo+in+galleryPDF 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_off0000df3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 10692 bytes
SHA-256: 3c6e494ff8f023b774e00497184a2d0478a2c230283c940107544b307a482c3b
font_02_sfnt_off00010f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8F 17580 bytes
SHA-256: 68df2e78da0e5fb612035b370acfa79f466e1089d0e07ad4d849875b495dfdea