Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5a7fe54fd6ad66…

MALICIOUS

PDF

86.3 KB Created: 2021-07-22 22:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6064a455f1be414eb3535da2f4e0fac9 SHA-1: 4a9cdbdd41c0f9ad2d32db24eedcc421ad51e0fe SHA-256: dc5a7fe54fd6ad66fb3989ed024076cad950d9e4d354348f924330af7c3fbdab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the link farm structure is a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://cornerstonelaw.eu/userfiles//file/nodumaxutijotirivu.pdf In PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/2c7a69d8a80da928a0a004b1852cc429/96683016693.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/fejosativikabu.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/44814821387.pdfIn PDF document text
    • https://anfauglir.com/images/file/44684288890.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607c178b474db---somifogevav.pdfIn PDF document text
    • http://djapm.com/userfiles/file/9085853854.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/93d30b39f03654e2f652903023254514/11565289896.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/30425007254.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/3841460481.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097e5862481a---lemewaf.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/35765329241.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/fomeberoderanum.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/wifuzul.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16071e12a754f5---22991368257.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/skt8susilktlpcsficlhtokgu0/vololoporuvo.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6e1330a79eb0e9771346f75b6a727c5a/zifezep.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3d0f8792943fa5c4638d11d27734bda3/59631963231.pdfIn PDF document text
    • https://paperland.bg/uploads/file/64853609123.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/fugurasuvavodisubogawevi.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-7/20210607195515551041.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/14715974032.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1d95ea000f7f65832f1e18bf4a8f566/jonemo.pdfIn PDF document text
    • https://epiphanych.com/images/file/60477306521.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/vozenexurojasoxazegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=anthony+giddens+sociology+pdf+8th+editionPDF 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_off0000eece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 10940 bytes
SHA-256: 35ea352cd5a976fc0b6ee300614ebd91295a89efc4220618c13e46873ea92c03
font_01_sfnt_off000107eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EB 16512 bytes
SHA-256: 5b1fc958f16a4fb38a4cf47a99d0a2f2ec1e5382751f963ae94ae8fba9bb5d96
font_02_sfnt_off00013296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1