Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d697b3e4df566d6…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 13:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90a186feeb822aa05c09edf5e1a136b5 SHA-1: 1ed47c0ac41b2b4b939ff870a9e7a77263f24e58 SHA-256: 2d697b3e4df566d60af28de2509f1203526a5e4e7f2b7e7a5019e510a026bf17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=reported+speech+exercises+intermediate+pdf PDF link annotation
    • https://manajrgvaaradhi.com/cms-uploads/files/19082625689.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/9755053265.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131206001a65---35472561648.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/25283446302.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/53892128055.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/71351391253.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137f4573afc6---damegaburusep.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/jasodi.pdfIn PDF document text
    • http://change4best.ru/upload/file/35497707007.pdfIn PDF document text
    • http://kes.org/upload/editor/files/dazowuba.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/6c23443a5b318394c526e11a069ddbb8/76027752885.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/feronazuxupa.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/wabidulomafesoxalop.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/16099676667.pdfIn PDF document text
    • https://renault-service.com/userfiles/82317579440.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/kezuj.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/99176416789.pdfIn PDF document text
    • http://anninh247.info/upload/files/84701570046.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/75385282805.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/44106639900.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dee4a9e136---texubaje.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/83373357184.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/kikekebiwisok.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/mosadabepotefefizivus.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_off0000cfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 10988 bytes
SHA-256: adaf46a565ca4ffbd9c41cb6f2f149251906de04160c1a33f56757135c77a679
font_02_sfnt_off00010141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 18548 bytes
SHA-256: cdfac4b4d1147f8c6b0dec8332f593b2625fa51509f5782305108e5972cf8481