Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18eaa60572b4264…

MALICIOUS

PDF

79.8 KB Created: 2021-08-27 15:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1755605cb51d9c49079f22afde5efe93 SHA-1: f81724cd1abff4b79ff9e791c8d9dd9440726135 SHA-256: b18eaa60572b42647984b24623887db74cc2f2e7de458f2b41fc4fa0924ded29
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The PDF also functions as a link farm, pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e96b93de37---mamuriludotuzojumakan.pdf
    • http://laureysnv.be/uploads/files/69743471813.pdf
    • https://hmanagement.net/userfiles/file/lenufejugubu.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607403c65e353---rekipesukasawufusit.pdf
    • https://denizlihorozu.com/resimler/files/73666099144.pdf
    • https://northcoteplaza.com/userfiles/file/tegipikinewexojuxar.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086d185f1af8---26550524626.pdf
    • http://shriadinathbank.com/uploads/wibel.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ec8fbeebb4a856c842578409bbd5377/lawikozuwapedelular.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/911f85fe6d1cb4d65fa72680af7a3d6f/zexelidikumatugixabuze.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/0ebe0428bb1f568ce4231e2cd48e6d9c/70001054379.pdf
    • http://espressobuilders.com/app/webroot/files/userfiles/files/pujigawoniriwidozetup.pdf
    • http://jeansresource.com/js/ckfinder/userfiles/files/31316177280.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f751db25ac5---54160902783.pdf
    • https://wegofa.com/userfiles/file/54180199730.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608554b6b6678---928064943.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ee08b4e24f8f479ac83a02ae9b8f6e80/72546320704.pdf
    • http://hanmih.com/userfiles/file/20210803074226.pdf
    • http://circolosilverblufitnessclub.eu/userfiles/files/33809906468.pdf
    • http://www.allatpatikapecs.hu/images/file/10400115737.pdf
    • http://canvangdientu.com/images/file/gofuzodesukulasodipiwex.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/ed635cc95a7f4f6dc17bc5ac19f2c292/papug.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/pe24tnfbcj3hd5jd7kv98j29u6/84678977589.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=we+can+all
    • 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_off0000d43c.bin
e9467e6c6a942f368dc9f594748016e0488e3d762bafd79a2ae7a1b514e577a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD43C 18820 bytes
font_01_sfnt_off000104cd.bin
944fda32d197d7cbae07b71456444aa646c5956746493b52acc3abfb6adb4d1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 9640 bytes
font_02_sfnt_off000119d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119D6 16792 bytes