Malicious PDF — malware analysis report

Static analysis result for SHA-256 82920a207907acfc…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 06:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b1321e440e476271cbc5fbfe1dffa74f SHA-1: 6a213a50ee482990ddb5b7ce1709fe85e109c43f SHA-256: 82920a207907acfcdb0e62c2733038c2041b710747e127c9aed74b175677ee5e
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 PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pistant.ru/uplcv?utm_term=solution+engineer+interview+questions PDF link annotation
    • http://bhhangkhong.com/upload/images/files/jiboninufunezoje.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/5v4n13o9268aasgje2aerr6e7d/wunow.pdfIn PDF document text
    • http://capri.lt/userfiles/files/xulozufeke.pdfIn PDF document text
    • http://cjatkinson.com/userimages/zipizotifoxozez.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/rezokejoju.pdfIn PDF document text
    • http://ipceurope.com/assets/file/97531468502.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/36064859644.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/zamav.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/37556368606.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89660191e8---buzesazi.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/tetat.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/vobelojafusubi.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/fedetasumiki.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/6a0ccc014415f230349f06fe23ecb1da/noxudojujibo.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/61654505713.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081c837a9909---47390287342.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/24990197652.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/vajiwuku.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/mojijudiz.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/193b9563feb511d7ed9d4b42e8ff0aea/64550426774.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/joxubevupo.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/vosutisowise.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_off0000ddfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 16436 bytes
SHA-256: 943b47e2082edac4ebbf6be194efcb0719685dde2a350366b3b93b6b82377853
font_01_sfnt_off0001087e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 10596 bytes
SHA-256: 1eb798b24508f5ef6f7d4c394b9e3eeece08c1536769c70c57a0a43f7b8fabcb
font_02_sfnt_off0001208c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1