Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb1bbdf70167f3e…

MALICIOUS

PDF

89.6 KB Created: 2021-07-10 13:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27c53b7cfe68c56419dde8d1377bcca8 SHA-1: f47d0b8d197c756ff685650864902f011a36a9fe SHA-256: ceb1bbdf70167f3e249a5ee6398014353ef5a46b6b4208ff345732e0ebac9984
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/41321612206.pdf
    • https://stef-nancy.fr/upload/document/zuragusivuripo.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607209c5f3efc---43208670407.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/7992d6cdc47d0ad77090c51d25f33dfd/xupik.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/1f3e6b7d8a16c5426c3a06aebbc897c1/fisiw.pdf
    • https://makanbanyak.net/contents//files/9239840385.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160abb801d48a9---furuboxuxig.pdf
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fisutemigezodarisa.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5584cac78---61141181322.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e999618991---rikusinidarakenonogo.pdf
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/pojubidomilisivideto.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/bb27df0d435168f66cc613cf8824e1fb/12982416348.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd658c0b3e---puwutibonareb.pdf
    • http://shuswapladystriders.ca/userfiles/file/wubirebonapuvedusosozezu.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/914abfd5e981ce16a2cff1a154167b23/85939469691.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f4b401fac---lufekuxazoxos.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609269cd26b6f---winadorulofobidofakalidu.pdf
    • http://omak1968.com/clients/71178/File/89973032925.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607884dde8629---27263499748.pdf
    • http://dichvutheapec.com/upload/FCK/file/75797845682.pdf
    • http://hotspot-usa.com/js/upload/files/tofovepidozexikulujef.pdf
    • http://alexandercdg.com/clients/36029/File/pekajipinogefonud.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/ded3db044527a72d3b35059109c99547/62748667853.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6c653cd8---26436530691.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=for+buck+converter+to+reduce+the+conduction+losses+in+diode
    • 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_off0000fcaf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 16792 bytes
font_01_sfnt_off000114c6.bin
60b70ac3f8b629f1a7ae1e92f9e5ee9c746c999c0698cd6f98222e4148b083a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x114C6 10680 bytes
font_02_sfnt_off00012d27.bin
d8ff5c40dcac89fca2f0dc753eebe1ec417e568c04895946f5d5a178757ab948
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D27 16700 bytes