Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4a27cc9d63c15b…

MALICIOUS

PDF

86.0 KB Created: 2021-07-18 22:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3716509504e789bee4441e5e2b644607 SHA-1: feb1881091f0b2aafe1eabb5fd6d18379b87215d SHA-256: 6f4a27cc9d63c15be10ac629874717761f6b0146be9d546b1e5cde0b188ebd1f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of an advance-fee scam. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a social engineering attempt to defraud the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/8cf02c4f49228019604178e95f2e580c/87598587135.pdf
    • http://schodylux.pl/userfiles/file/jokakonamofafusigagubobo.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071580544b0d---35352838511.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072572f2a9ff---64251873233.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/17145074602.pdf
    • http://controldellaves.com/app/webroot/arxius/file/lidazog.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/0312f0ef1908bb5d64a8c7c3f17a791a/wuvopexufuba.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa53d4980e5---56544168876.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/c60f624ab805d3f073b7aa86b0e6dc99/50083516656.pdf
    • http://georgefamilyreunion.org/clients/86186/File/78361737277.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/mrp31t361hkvt92drv413fc60d/sarusupo.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/8ee5ec0cefc1b9db6113228e264cf9e9/zojin.pdf
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57227741990.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/574539211e443b63351e57bc051cc9f2/64272198363.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ed899d91e---77741653581.pdf
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/9868cc3a6ce6f118b64b339b62a18570/38436276902.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/f93pvlg61to5j8o74na8ceiieg/losufiguluwavotutuk.pdf
    • http://tvoirostov.ru/ckfinder/userfiles/files/lewazupason.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1440815506---50635610041.pdf
    • http://salt17.com/userfiles/files/pamuwowodawemubiroxa.pdf
    • https://fnb-concepts.com/images/uploads/files/26586914033.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/cr0r6q6kq9j18u74j3u5ljdiqp/5860677582.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cool+spanish+names+for+guys
    • 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_off0000eb3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 16792 bytes
font_01_sfnt_off00010352.bin
e6d3a7c2346c581c8aba82f90e566a3d08572b1758b19c70a565b4f92e160f85
pdf-font-stream PDF embedded font (sfnt) at offset 0x10352 10952 bytes
font_02_sfnt_off00011c82.bin
c5329204e34740df6afcc02d6d3fe829f732dbc02b73037741425c1f38e386f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C82 17716 bytes