Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f18d6bbfc4ed08…

MALICIOUS

PDF

87.5 KB Created: 2021-07-06 05:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f63a3d34d7dd3ade3361a42177593b74 SHA-1: e5926f0faff29b9cebe4360f83ed792691549b40 SHA-256: b6f18d6bbfc4ed0858557e830eb7d9e5485dc6d87d8099099ff18c9f58889db2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to host malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a spearphishing attachment designed to lead users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48833056a---zofepajepatajanani.pdf
    • http://allmedicus.com/userfiles/file/xiwuzu.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/xulopazizijofidapawi.pdf
    • http://canoeing.by/pics/files/53696811398.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/hn77bi0st9hu26q9ujg6bi5m06/12480938547.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607725f9aca41---97103383109.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/sg533b5o4e3lc2v8qrt9asl9cc/diweda.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/vnkbj280bj114b2gsrbrlsu803/puxagu.pdf
    • http://nbpcpentecostalchurch.com/clients/65183/File/76833460373.pdf
    • http://rilta.net/userfiles/files/96729414362.pdf
    • http://soflocops.com/clients/67403/File/51952290666.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3bb2efdcc---tozinidudedenew.pdf
    • http://turnyras.lt/Files/file/21786780091.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fcb030126---66989915307.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070806781340---gixiwiburirujuromurux.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/9fdaa6d2006ada2389605cc22128898f/vusivimezixiseg.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a419af79499---43558027131.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e11af0b451---bodenu.pdf
    • http://abwrva.com/uploads/files/jujixote.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987e1a97600---66228062264.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/49334071721.pdf
    • https://internationalmedia.com/userfiles/file/nezokexemowapinunew.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=free+title+pack+premiere+pro
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f308.bin
f78b08bd417e7fae66a2dbad1b6849a876fe5fa693ad95b51ab7e52fcd8cd890
pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 17032 bytes
font_01_sfnt_off00011fcc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCC 16792 bytes
font_02_sfnt_off000137e3.bin
0d22f54e1b1f15744557be85e011591cf5c17f488f462ad62efce75c5e34c53a
pdf-font-stream PDF embedded font (sfnt) at offset 0x137E3 10332 bytes