Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4cf510fefa30258…

MALICIOUS

PDF

93.2 KB Created: 2021-09-14 00:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d73ec1d03f35707106e10a39f65eed22 SHA-1: 48ce6a7a160add78351ec86ced8faa76aa491961 SHA-256: c4cf510fefa30258cf38b99e855c9a2026f700dc9ca77097ef3f62c562c3c86d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The presence of these links suggests an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 http://giaydantuongphongngudep.com/images/news/file/84131145626.pdf In PDF document text
    • https://partetesal.ir/data/file/71487857240.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/gadavevadanegadixiwofeda.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b90400b223---xazunanijexegezov.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/19536393545.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/66550721083.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/dunabogenegof.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/21413979568.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/tisik.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f39ffbcf14---358138680.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/nodofalituzafupubodexiv.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348d81d1f53---72547754588.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613479ed6bd97---16836783336.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210907_162006.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/47700405162.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130072982370---92119823236.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/27711863935.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/90913389851.pdfIn PDF document text
    • http://cosyromania.com/media/file/diluvixugelafawazivamiwi.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/gobogekinutena.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/20078222012.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021911222439.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/24333955090.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/rinesevilavifurakijaduxod.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/gutazik.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613925aa7c17d---jukerimig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=all+ladies+do+it+full+movie+freePDF 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_off00010922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10922 10560 bytes
SHA-256: 7fac6d09634569941390d9e275a717eda7a2face43898895760616d4891f7056
font_01_sfnt_off00012142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13954 17584 bytes
SHA-256: c247316842e2689d6120efe277382a57dfe75ae630f1987c88106cf303398534