Malicious PDF — malware analysis report

Static analysis result for SHA-256 0367f04a548b8dd2…

MALICIOUS

PDF

86.2 KB Created: 2021-07-26 07:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c63d2e6a1e756566a63d40f82bdd5ad SHA-1: e34f0c7287ea6b91715e64cc2b49eda94ad43f57 SHA-256: 0367f04a548b8dd23a85140926e0a3e0be257824637e676f42de2267e2432729
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and links to compromised or disposable hosting sites. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests the document is part of a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/b9aba402894faa915d9a8ebc39d47344/89203604082.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071e17e3809d---10237760641.pdf
    • http://pantryscan.com/123cars/imagefck/file/xukaxoperuxas.pdf
    • https://maconlux.lu/userfiles/files/84075333508.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/49415016295.pdf
    • http://canphantich.net/Images_upload/files/91269986860.pdf
    • https://bookatowncar.com/userfiles/file/24388686719.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce2d9d48b5---5167806162.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/k59ajbse4r5apkggd3u9sof8kc/7723032902.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/48usf4f2k395q4ppla9hl4nltb/27163785510.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/da6f743abf6ce144abfabedef5908b08/78915463132.pdf
    • http://energy-labels.com/userfiles/file/69566491190.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b93d78ac1---wikulula.pdf
    • http://pitin-akutsu.com/js/upload/files/lirilojexopix.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/vm8vvnml72em0sj1p7qgt1rv6b/debalimo.pdf
    • https://lotteppta.com/beta/assets/file/kinusilupowewogopipe.pdf
    • http://hoangduy.vn/vn/files/japanen.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1163b850c---mewawerijubijigurotijuk.pdf
    • http://vuonlan.vn/data/upload/files/45137651733.pdf
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/10110634745.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cce03b51838---55708708844.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071871f0057c---29958282402.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+change+active+to+passive+voice+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_off0000ed33.bin
8a1303583e5e88aeea3588df1c4269524defeed84cc1ab7a1d2461aa9023e044
pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 16856 bytes
font_01_sfnt_off00011917.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11917 16792 bytes
font_02_sfnt_off0001312e.bin
ffa4bb0a1c0f0b3e4c3421b167fbc41286b0976ba70eb7f8034d9c42505c9019
pdf-font-stream PDF embedded font (sfnt) at offset 0x1312E 10896 bytes