Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c230964fa24bb9…

MALICIOUS

PDF

71.2 KB Created: 2021-09-03 04:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a9b2ce99096d490001c5da055ba18d31 SHA-1: a44bd56b24332804a5e87dc7c47b380956a7b953 SHA-256: 71c230964fa24bb986c904427dce1cba34907dfdf884169fbf3cb3e497d30383
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to manipulate search engine results or distribute further malicious content. The ML classifier strongly indicated maliciousness, and the structure points towards a spearphishing attachment used to lure users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/8f7d808a2bb3789f7809372819c734a8/57749245591.pdf In PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607314786febf---tasunebawutew.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/durefomusipilowo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/j9759c3jlv4qnp9ggbsu2r2dr3/vawekokajomezogadaf.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/xewetakabusudepalu.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e3fd9c55d6bc1103d98b0e858dbf0884/sudis.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/acc73486979a2ecae38ae41ccf1499fa/58736669321.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/79449981536.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/44fc404df4082650d2d9180b8ffa24fe/70355137711.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e9f2a5cb21---4238588162.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/gugozikubukowufexofofixed.pdfIn PDF document text
    • http://chinalabware.ru/d/files/48979408261.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/zisasepi.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/80975400964.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d00b44a794---84972778596.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c74e52ef41---monixajexigasideg.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/51608361543.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719701217a8---terofiji.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/12374343327.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/79416296485.pdfIn PDF document text
    • https://questyme.com/userfiles/file/73991526438.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/98924933122.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b6d52051a---51653704043.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096b21e6ba30---69129580879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cell+membrane+%26+tonicity+worksheet+answer+keyPDF 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_off0000baf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF6 9964 bytes
SHA-256: 6a2f5867ba6f0c109fa4ddbfc501c5dfd9b390edb48ec169105843a47b48dd85
font_01_sfnt_off0000d0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F0 15252 bytes
SHA-256: e03303570f1bcf3d5c3a69a1068b940fdcd5ead11f85b738626d2fc0b585d200
font_02_sfnt_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1