Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbbdc931342ecc5…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 23:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc562dd7e623bdd4b693be0618c76899 SHA-1: b022b20f72c00e13b1d6dcd172849a41224fb7f8 SHA-256: 7cbbdc931342ecc59b548aaf679ef9398f4243b86ea680b6b2553d8eb39a77eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://garglob.ru/uplcv?utm_term=i+want+to+watch+dragon+ball+super PDF link annotation
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16146c5f9220c2---xazutapiravorufawakod.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/111441457290.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/82837211026.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/d395c5d98246d9bb5691d62bb94e2c85/81702730424.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/74261363475.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/88659829164.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/tebize.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/pukudizezux.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/kagonirubafupewipata.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/79075662041.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/20409142143.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17466612867.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/69a5a8550c4e2a2bb713f74062ca2838/kobopilamema.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614509c62741f---nimolonereligimav.pdfIn PDF document text
    • https://assofmt.org/ckfinder/userfiles/files/80340237606.pdfIn PDF document text
    • https://korankertas.com/contents/files/galozugupivizakafobaden.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/vusipudeta.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/rapiwalekupadaruginofot.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/jonubevazajibivazelenawak.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/12081378862.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/72925872820.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614090954fd0e---25521880261.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/mexukafobixorenafolunegi.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_off0000afbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D0 16372 bytes
SHA-256: 03490f3406723530c242e602c71770f63868436908f95d880cda49e3145fd29e
font_02_sfnt_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 10976 bytes
SHA-256: de5fc5c6f91488041229f29c38c2fc4b9d8712abe534ff0c7b04c96e08af5e4f

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