Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35c440097947e53…

MALICIOUS

PDF

88.7 KB Created: 2021-09-06 01:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ac2790cb8d1dbd7a272b55ec46091be SHA-1: 7b612bed1c16403b351abccbf1d34c01d1a894e4 SHA-256: e35c440097947e53a98e0c8b336cb00e5cb35f811b067b97fae39dea174a877f
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of a link farm on disposable hosting further supports a malicious intent to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=adaptive+leadership+definition+pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a00a1f3596a---98854442300.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8db4899520---jimizadujiborada.pdf
    • http://www.cerathai.com/image/upload/File/xovewogiwigozinirafiwijul.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080548d1e047---70391597266.pdf
    • http://ecandrychow.pl/Image/files/68719406167.pdf
    • http://mictrogiang.com/userfiles/files/xopewuresugovimolo.pdf
    • http://konferencii.org/js/ckfinder/userfiles/files/6769447732.pdf
    • http://cascad-trans.ru/files/79016549901.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160816cf63d843---dosegipupojepadopobugujo.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14809813702.pdf
    • https://francemonde.news/UserFiles/file/jirur.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/n6hhuvgov8ui6jrufdjcb8hlm1/mogajizazazudugakat.pdf
    • http://tafgambiatours.com/userfiles/file/podanulusamunosodet.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca114913c8---silizubemowov.pdf
    • https://malabarmail.com/ckfinder/userfiles/files/dazag.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/284bc83d628b79b310a50631c95e5223/48338714415.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/41655402727.pdf
    • http://greenglobepms.com/uploads/fogoxafu.pdf
    • http://mundori.com/js/ckfinder/userfiles/files/baganufozilawoxazuzotagaj.pdf
    • http://portamarioarchitetto.eu/userfiles/files/jetanumumezatojor.pdf
    • https://businessservicesuk.com/userfiles/file/57309022781.pdf
    • http://smit-electronic.hr/upload/datoteke/babagekezozujanijebofuziv.pdf
    • http://gdfsztal.com/uploadfile/files/paworevux.pdf
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/74452926292.pdf
    • 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_off0000f5cb.bin
3ecc2ac3dacce46acfc8156d9440fa703010608b527ee2858397764a69d98b63
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CB 10640 bytes
font_01_sfnt_off00010e1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 16792 bytes
font_02_sfnt_off00012630.bin
274972d01378c5981d4e3523bf76e019826f89c1d3de585f0cc4a3bbb9025d18
pdf-font-stream PDF embedded font (sfnt) at offset 0x12630 18116 bytes