Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e843096dc81037…

MALICIOUS

PDF

77.2 KB Created: 2021-09-03 08:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f63d900ce754e40e5b8b3f717a7d3370 SHA-1: e481c087a9b49923281e54b52fc54e75a66b1357 SHA-256: 87e843096dc8103783ac0a4873c15f329e19b5f449b819c53a3f73d1906a125b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://abworder.com/uploads/files/xukomedenoboxurisikudusuf.pdf In PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/48478803034.pdfIn PDF document text
    • http://darec.sk/files/files/varatinosuxamugirexumo.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/ruwifipugosevoni.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb97b4747a---51523757192.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/lekez.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/7655236935.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210708085046.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/fanaf.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/909f6a6bc0fa657405690371d9a8d8df/46945946474.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/lokemaril.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/34131230208.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/71843306279.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/dabekikorejojoxisesoxof.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/bobexevodatupekiwepivaje.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6496a861c---sogij.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/zegefaromuta.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/723cf48ff53943177d6670ba4030543a/29051049747.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/pajelobidajadese.pdfIn PDF document text
    • https://giovannicaputoboutique.com/file/61720380921.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/duwosu.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/83576041903.pdfIn PDF document text
    • http://meadclassof1991.com/clients/c/cc/cc689d7a74a098ef67b43942063c7ff9/File/zixisizan.pdfIn PDF document text
    • https://conrays.ru/f/data/vakoninevebapotemuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=excel+worksheet+merge+cells+c%23PDF 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_off0000ccbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBB 10584 bytes
SHA-256: 5451e3c70ee50825e9fd1355b5d95d5c011a4ed864e7f3f19ad9377c44a5fd2b
font_01_sfnt_off0000e50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50B 16372 bytes
SHA-256: e062cd60f342150ce85bf8e44cabc732229ca98760303eda3158683aa51379e1
font_02_sfnt_off00010fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1