Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a0424d53e7c969…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 23:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 68cfd40a8ec071ff185e4472a7eeb64e SHA-1: 22d889032b99ee1941c24b6fd59502b9d7030b7e SHA-256: b6a0424d53e7c969fd30de100970a4a64e18f7937e69b9d8f009ac1d419075c1
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains, some of which are identified as compromised CMS uploads. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or distribute malicious payloads. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://art-lamps-rali.eu/files/file/vetupapolezevafed.pdf In PDF document text
    • http://kd-council.com/upfile/files/23566014671.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/89674142572.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/kuwunokibilemidirolagad.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5uvbdelnbjq1iinnh572i86g9p/xofufanevabufap.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/wejunejenojugis.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/29013027566.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/55394541294.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/45181949749.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/92553396719.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/zomolesoko.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132d01e49379---tizivafakepunatajimuvibu.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/wifowiremerusopuzeponevak.pdfIn PDF document text
    • https://umutfm.com/resimler/files/27062773746.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/75681580079.pdfIn PDF document text
    • https://questyme.com/userfiles/file/suwosewowomovudafunob.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/tigamotoxusebopoto.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/98977180753.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6f6a34076---44706673757.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/55438214224.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/wewifipedufidu.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/85112366614.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/6ef3c58abb80e602603112f4d517739a/80382586995.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ddda57370---dogifufugatedeburalode.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/19832002000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=wonder+woman+1984+online+for+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_off0000e070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 10836 bytes
SHA-256: 3e91e21f6f9f619dc139151168097360364b1e0e62c4623cc8b64d7ad0869388
font_02_sfnt_off0001119d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119D 18984 bytes
SHA-256: e3dee103a1aaf2d0c00551127d68e76539237a4279b71952cd404e3698e12436