Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d6dcc1b442eea3…

MALICIOUS

PDF

88.4 KB Created: 2021-07-07 14:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 924ae3ceed6d1dfa03a036ae28bc6e89 SHA-1: 96b31603f0759390c5967c3e513deb65b2279872 SHA-256: e4d6dcc1b442eea3cc7f4f9294848b18912af3741f654dee98366f4d069704de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also flagged this PDF with high confidence. The presence of these links indicates an attempt to lure users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=how+long+do+you+broil+chicken+for
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/j2j26stmvnpkth9je245cglto2/sosezawele.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cccbe77c286---17855255051.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086095e029f0---32779387480.pdf
    • https://bdaudit.ro/userfiles/file/pusigoruvi.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e754e374d9---43214650892.pdf
    • http://nemdanangpho.com/uploads/2021-05-26/images/files/32531133121.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160878d1250a9d---26484606285.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16077cd8e4cad2---zeletelukevix.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f578929bad---27248005516.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/q1a1uig57ojcd4ocufba20b3od/vinugexuwebadakujusi.pdf
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/dupogawasufezus.pdf
    • https://sonarmusic.hu/up_image/file/89875526490.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/0qhj4h8n0tgqlnujtthh9k2vr9/69359569715.pdf
    • https://cmsschoolkg.org/userfiles/file/45552479503.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/d5q6t7t8ugb0uiups00pmikg0q/jotebobuzuvivovexij.pdf
    • http://limuzine.md/userfiles/file/58579769058.pdf
    • http://aotwresort.net/ckfinder/userfiles/files/21247964232.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdccde7799---82055026689.pdf
    • http://vetcarefoundation.org/userfiles/file/41691956779.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d83c23c26---47569836541.pdf
    • http://www.anjhimayath.com/upload/file/39282477747.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/52eee4c932cc4e575bb76b6aa947addd/mabupiwanevozowiwebamo.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ff94bdcd21a7ed450fc24f3a92117ca6/tesigikalukarinadajuz.pdf
    • http://hoangle.vn/uploads/userfiles/file/8448263713.pdf
    • 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_off0000f60d.bin
33bda2e40e297ef66f176f6b7988ebdd5d582d1f08c7818a318400b53c92e00e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 10848 bytes
font_01_sfnt_off00010ecc.bin
1998cd6e146c3b16b90ec667de2ae50eec1f3d0e3da1a16b2ed1e2a23476d430
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECC 17360 bytes
font_02_sfnt_off00013c67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C67 16792 bytes