Malicious PDF — malware analysis report

Static analysis result for SHA-256 166ce795e0a811e7…

MALICIOUS

PDF

87.2 KB Created: 2021-07-07 16:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1730cd687d2e163302b92b98b7bdda9c SHA-1: 3723f7b83d4763ab7c8a1f1a7f98626f9efc7b6d SHA-256: 166ce795e0a811e70ff3554725e41acf68b63e20d3467b78fda4c28687c79083
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with high-severity heuristics indicating it links to algorithmically-generated URLs hosted on compromised WordPress sites. These findings, combined with the 'Urgency Lure' and 'Invoice Lure' heuristics, suggest the document is designed to trick users into downloading a secondary payload. No scripts were extracted, but the PDF structure and linked URLs are strong indicators of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc768101c5---32393529904.pdf In PDF document text
    • https://cowichanseniors.ca/userfiles/file/fujaxam.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/56262788799.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608857a2b3c38---22578971483.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/bojapurukefesewuj.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/3e307204c8fa392d5471f61aedaebee4/16432932360.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/metuvuj.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d1c3be105---92759888094.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d027f4c854---jedeledesiziwimirezu.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/mcs71cdgkbua19223c8kqtg1te/96739074079.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/2012395399.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/29e2802066b017a71196d5b24343a83b/rinevewoxupeluzabipaxepab.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/a346bf80634aedadc3dc76999af50850/55286799371.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/87081412279.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/56430842141.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/24578538525.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/39180658787.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/ruxanivizusiko.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c08117df---43361350447.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/86243438148.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/dfd48396a8172c00a20b8c7b11559074/xaforod.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/0o902sbscbkhsn9k97a142r2h4/fazuwesekelumeze.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1c04c417b8bae9fa0af1dd3abc2b9cef/dunoseranudi.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/6702531372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=negotiable+instrument+act+1881+pdfPDF link annotation
    • https://rb.gy/l8oktuIn PDF document text
    • 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_off0000ef4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4A 17428 bytes
SHA-256: 7f89d853241e2a6a413a895d929fdc65344a9b377f1c957bfddc934b871d71e5
font_01_sfnt_off00011cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD0 11440 bytes
SHA-256: cb16e2487aad1ba64b2afe0dbd3f709c3e6c05924943da33687fbf10af3331fd
font_02_sfnt_off00013778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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