Malicious PDF — malware analysis report

Static analysis result for SHA-256 570bcce944c88eb9…

MALICIOUS

PDF

95.3 KB Created: 2021-07-13 17:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30c01c75f4387dc593aab818aab574bb SHA-1: 93ab925103f0e3dc19d6cd90d7577d32d5670f3c SHA-256: 570bcce944c88eb95c646c09e8c98d58eb06acc62561f0b2f210f625965838e8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised or disposable domains, a common tactic for distributing malware. The 'Password-protected archive lure' heuristic indicates the document likely instructs the user to open a password-protected archive, a method used to bypass gateway security. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bestrecycledautoparts.net/images_i/file/53940517428.pdf
    • http://arredamentoambienti.it/img/file/tutazovasifoxuzawinuwepi.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7aa6ea4f3---49496927194.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/82405603762.pdf
    • http://lg-palette.com/upload/files/joruxedeb.pdf
    • https://veterinarycarefoundation.org/userfiles/file/jebipaluliritez.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/04b3963d9594e40b05c96d7f5ac72c38/29356577230.pdf
    • https://airtelco.com/data/users/_/email/files/47609085489.pdf
    • http://cz-synergy.cz/data/file/52763413705.pdf
    • http://asfalon.com/__files/file/52658043623.pdf
    • https://mariellatriolo.it/public/file/pojiluwotusemakunura.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vtq1g7vkdnj7v9grcjk3snjvn5/xuvixagonoviku.pdf
    • http://hugslock.com/app/webroot/img/files/8908980057.pdf
    • http://ruilong-ironwork.com/CKEdit/upload/files/sazekafevomeg.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608219932e2fc---88699870212.pdf
    • https://alshuka.ps/ckfinder/userfiles/files/wirupegoxokesobeto.pdf
    • http://crmrealty360degree.in/userfiles/file/napufovujadoxuv.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c386388ea---85350501606.pdf
    • https://heks-tech.com/app/webroot/userfiles/files/kojofojuwe.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086a805c6c2b---49261977546.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3bef67040---76827990877.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8ca7bee06---gesebitomutilora.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/dcb005e50f52fd6ed0fb886073cb1f19/18095157285.pdf
    • http://theheavent.com/userfiles/files/doxitigabikanixuzojis.pdf
    • https://oxi-dental.ro/imagini_ws/kilotizesunivazesika.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c95de1610d43a8cf1926e2631db7d2a8/tagalajazulerumurobekijob.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=last+10+years+question+papers+of+jee+mains
    • 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_off00011092.bin
fa9a1c3ca1653e52c56deb0e18210e12b52be414f94430a5a2d061883a264de4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11092 17084 bytes
font_01_sfnt_off00013d3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3A 16792 bytes
font_02_sfnt_off00015551.bin
7375fca21754729d00f3d490d4c9c1de9500f5f35dfe4a57ce3b97618ba2e311
pdf-font-stream PDF embedded font (sfnt) at offset 0x15551 11096 bytes