Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aaa6762d9fe99dd…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 03:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 38eb508ae2ef2c1e9d389e28272f7f24 SHA-1: 79229e84e6628c5968173fa400337c009cb26977 SHA-256: 8aaa6762d9fe99dd7205b31182d225ad080408ae04c53513f05453c23023b62d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/pb3ijj4skcsunl8e4aoo9rojc7/35686992100.pdf In PDF document text
    • https://pacie.vn/web/uploads/files/56864638031.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/78056159673.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/13669609941.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/ranowovegakeduruji.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/6f92f97d0b2e81072c31cd2d6325a259/todilagesuz.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/79633877932.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/bikegivazigisuzim.pdfIn PDF document text
    • https://clubon.top/uploads/files/fegara.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/50759196708.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf58dba4528---dilerelepebo.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/ruxileperef.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16071a29625065---26430389200.pdfIn PDF document text
    • https://iltuosarto.com/file/95336689940.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/pitoborebiwapekawo.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a45877881c7---siketadi.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/veraxusuti.pdfIn PDF document text
    • http://18554080.com/userfiles/file/xavogavobinirepikuzox.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/5ccde42a758594fc18de58f0b01235ba/47487622280.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/63788142055.pdfIn PDF document text
    • https://atl-50.com/files/file/zuradegosadazugawutes.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f153c3f256---19160204741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=troubleshooting+and+repairing+commercial+electrical+equipment+pdfPDF 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_off0000d2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E3 16648 bytes
SHA-256: 011bcbadfb28410d7827b3e5df81e2bc5617e1e963284678072ffc47a4e1a89c
font_01_sfnt_off0000fe0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11626 11416 bytes
SHA-256: ace7fafc587625b6eca25e638ffddda3c1602b37238205746cf3e86efb5c9928