Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be398525e288add…

MALICIOUS

PDF

86.8 KB Created: 2021-07-13 22:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9e8b686a0eb7cefdff9a889a85fa5bd8 SHA-1: 7d6dcf7931368def9bfbab8a8780dac3f4ca7524 SHA-256: 9be398525e288addf025b4b35a0a90b707b6b630386ca2cbc5dcaa166df8d8a1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://archism.ru/uplcv?utm_term=the+new+colossus+meaning+line+by+line PDF link annotation
    • http://busankid.com/webfiles/board/file///9049429035.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/loguledejuwulabux.pdfIn PDF document text
    • https://hostmegasoft.com/calisma2/files/uploads/wepumexogegujonixisax.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c601333e2e0---62525168550.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/63309974279.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/19800740640.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/49062812620.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/9fe572c63c559e23aa5cabffba71e72c/93632859018.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/sivugowaxonavetegam.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/c58d6d5ab28eba76ae043e6f197a0ad3/fogijajumimixowaru.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b548e3c32c6---40244310526.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd6b194640---tujid.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/wunakawofavilarev.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607184fe36452---gimamilogebomaxud.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740e14bbfab---gefuzulukegonutexukado.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7cd981243---96645715748.pdfIn PDF document text
    • http://safarang.com/basefile/files/davavapobejafevemaxopez.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/s09p297lgg5sc3qibka7fa90p6/matudenafuwemexabaxidipev.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bebc6c35c---pukosotuvax.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/b8ed03dd26d6ae19ecbb1a1707fe4329/gafisumajorepef.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d90ffadc94---23949591974.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f1a001963dae031b2e93088e077de8ba/40156332261.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/37502033922.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c0c3ad517---77906681139.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f39f95e87338b971badd57af3bdee3a2/81582391755.pdfIn 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_off0000f180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 10884 bytes
SHA-256: 6294b777e28f21761734eb37489df1db783f3f95b9c179ba5c1d130ae7d0f4af
font_01_sfnt_off00010a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001229d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229D 17096 bytes
SHA-256: 56829ec5b4caf21f6acddc08179cc71e3566f5f1bd5ecd7d786d319bf25fdf3e

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