Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaef1c8622277823…

MALICIOUS

PDF

85.8 KB Created: 2021-07-06 13:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8f55d05e33e9caed9d3b1845b783cca7 SHA-1: 86fba8b17413b8fac5f7b0eb8060583008954e92 SHA-256: eaef1c8622277823bb4191f99ead37572b1c75c5c11213faab2d812d68c5e1df
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. These links likely serve as a lure for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cedece19a7---zilugosutejalufi.pdf In PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/74cde80da5b0801443aa9c32bbf9bd21/wopinop.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607574731450a---sujajofisunudotomejo.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/426387ef544229a59acdc964e7841051/tibaxilomijosavulosewixeb.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/1cdf3d35c3e5241dcef97ee75ae25661/30504955099.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/lghdfupss05qj1lvpu6qeekjb4/8185827670.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/felesepiruxobujeta.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/f699d899eab44283c9115300c89e542c/47764025227.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3e0a31dfda144ee69cbef07f07c267da/90076236514.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/38399026192.pdfIn PDF document text
    • http://teledirk.com/d/files/1111209783.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810a880c7b5---2121485413.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094a2d77b169---xiduxadesuli.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d6591348c07---refugex.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/141e50815f2d3b079001ebf324998c3a/28735862607.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ae32178f8---wigogulatag.pdfIn PDF document text
    • http://runo34.ru/attachments/file/ruwoleg.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/94eeb02195baec6895627fef7b92ca68/76646209466.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607828f5e2107---zuwenaruretezuvikesexoxez.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/97589159833.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e5b92868d442862287ff12950a7a4305/61016996571.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/of6560mgij51t2rrqjo1bod1a4/dafexiw.pdfIn PDF document text
    • http://zae.me/datafiles/file/45257607054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=united+life+and+accident+insurance+companyPDF 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_off0000ecce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 11000 bytes
SHA-256: 9f09a4ac944b36aba4f8bc8b6ab949add9ac8c85d152d4d9a930881301e0907b
font_01_sfnt_off00010660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E72 16664 bytes
SHA-256: df1418934bbf7e370a7c5480f892824c864e90156475894f2a3e2fc729712b56