Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc802dd634c85d4…

MALICIOUS

PDF

86.6 KB Created: 2021-07-07 19:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f56ff06b28a30f475c3dadd0e9dcb8bf SHA-1: 3fbbbc0fb6ca3ac842353a1a66a588861d9bb28b SHA-256: 5dc802dd634c85d4377073c48fd2da38a9f26eb45012443c3bf6111d115eaca6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

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://catamma.ru/uplcv?utm_term=overwhelming+in+english
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a810e5364a4---31687290248.pdf
    • http://duocmyphamcongty.com/app/webroot/uploads/files/liwosusaxufiv.pdf
    • https://trongtrucsolution.com/uploads/files/25959351984.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ebed57918598516e5eb7dd71692e0759/78050508090.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae636bff93---letogav.pdf
    • http://agataklimowska.pl/userfiles/file/43335116428.pdf
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/laluxup.pdf
    • http://banlinhkienlaptop.com/userfiles/file/73160092235.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d2946fee---bemafebuxajizelobamemi.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3de9d1962e---64552624682.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/fda6a27591edb0020e3d50dac233f6b1/17780640764.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc3c59a3d9---xeburaruxur.pdf
    • https://gastrotest.co/ckfinder/userfiles/files/logomupifoxijol.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/5b93d6a7a06700c631d6b955ca03fdfa/viwutuzid.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082455e05170---fejibesomuponamejebu.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/617a3d0e06d16138cb7107af3bad2d89/kewijitulewofinaba.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afff1e492e0---torivifomik.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a253787fc9---zotigolofazimoten.pdf
    • http://andrelandberg.com/userfiles/file/26999310051.pdf
    • http://travelshops.pl/userfiles/file/70642382545.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a029f3562e4---24142325288.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/b8bbflb0h8o48fiqt2brs9bl37/wufurogovojesejutizubase.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/q1roe2ln0nuhei1n9k5u4hda8m/18194847523.pdf
    • https://demircanticaret.com/userfiles/file/bexalomelepax.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_off0000f0ad.bin
18562a0ac7e0cd3e0c643406a90d51d6274e428584ec09a6d31a59aada662e78
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 10352 bytes
font_01_sfnt_off000107e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107E7 16792 bytes
font_02_sfnt_off00011ff9.bin
5f9028c9f688559d45a1d1a6178bb7e89d77ab19721178da6d43d33bcedbf0a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF9 16956 bytes