Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5eb485c145c3697…

MALICIOUS

PDF

84.2 KB Created: 2021-06-25 18:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfd5e03a9221adea559b885951df587f SHA-1: 1b106d51eb65fc61e1148f46fbc0ee63318fbf56 SHA-256: e5eb485c145c3697244dbfec55e0c1f5fc889788828a4ce1f7e7f531d139418b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The heuristic 'SE_INVOICE_LURE' suggests a phishing pretext related to payments or invoices.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • 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://chinalabware.es/d/files/posom.pdf
    • https://folklorebridge.eu/uploads/pictures/files/30941217284.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/30863719b73ae33afa159850a3efa564/potidiwate.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1167bdb48d---45713192530.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a919b28f9d0---xodapokatipabe.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bc7d9cf0e0401da42ac448db8bc2b7c6/bakuseg.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967263eb5bc---muwifoxe.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/7o4i4nfmoopvck27f24hhh6cmh/85046073575.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/423b1339324d628a453096e7a2f870f0/25704713302.pdf
    • https://go2germany.ru/files/file/dekojikokidukesisujik.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/tis4kpcjugkpsob995ncdo3oo4/kotoro.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749b81b5742---22045052920.pdf
    • http://akinmedikal.com/uploads/file/97654958383.pdf
    • http://jkmdc.com/aversystem.com/userfiles/file/kisekagawivonadekipof.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/98646a489f60dea07360fe042d6772d3/dijisoguvogifesebus.pdf
    • http://csim.jp/ckeditor/uploads/files/72427265872.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/6549a6b358e24d6c3d4453693873a4cf/52203444088.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095921bd28e7---31992903952.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b10da1b0b8---zaxelufemel.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=charitable+contributions+cares+act
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/908c391407d6b3d3c6ed3c0b50fc53b2/57623887855.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_off0000e535.bin
b3bb48e00c11d1dc24613ee3263ada4598a8814881eb75b0a2e59652e204b3df
pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 17284 bytes
font_01_sfnt_off000111f8.bin
2363d201f594c49cb3e2f6c50ed072157160e992634b983d4df827c208cce669
pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 10600 bytes
font_02_sfnt_off00012a2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2E 16792 bytes