Malicious PDF — malware analysis report

Static analysis result for SHA-256 b062b8b1458ccc9c…

MALICIOUS

PDF

99.0 KB Created: 2021-07-08 12:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7b86b61ecb59c571030d8ac883f5c8c0 SHA-1: 6a376b82e0f3108838df876058ba168caa94aa50 SHA-256: b062b8b1458ccc9caf976842c0f5c5fa9d0ca42b3591a0393dad8401d9ad5e66
204 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document employs a remote support tool lure, instructing the user to install or connect with such a tool, which is a high-risk tactic in unsolicited documents. The numerous embedded URLs, many hosted on compromised CMS platforms, suggest an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/d69ce41f69bf1468a9c7bd0506073878/66178537627.pdf In PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/fomatozeli.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607161934f146---39377761981.pdfIn PDF document text
    • https://drsaman.com/files/zalopedesilubefuso.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/a40a31353164f947402777f81dfd508d/49774610817.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/42694666485.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608770fa6008e---29586195092.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/nabumunibasesa.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/bumiduzemunutuw.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609860944c730---rarosubu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cee10a37894---labagukabatudujiwux.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a818a2c3bd2---67654041558.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1af948ffedd3adf6e3f164c4de239d1a/goxuz.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0557b23234---fijemut.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/5f83f0dbbefb5e0179416907aa56cec4/55513049387.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/12595541382.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e8017ec5551871904d50b535e9c63d44/28489289660.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/xulutotugo.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/5ca6e54ff496fa5a348b40ef29428df8/92580243909.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/djs1lfu5k0bvq2lqlsi00vbgu1/raposuruvifibidosi.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/ab59ad5c3db21cc450d2e6db3683215e/giwamixebepaguwozaxolavat.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/59ba9dd5e7a40b8788d92704a359ae13/45277348679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=shingles+not+contagiousPDF link annotation
    • 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_off000121c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C5 17228 bytes
SHA-256: 0e90d652d6a5a997210fc4021c0facb2c7f7e594b17b2022daa878bd9e8792b1
font_01_sfnt_off00014ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000166fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166FD 10584 bytes
SHA-256: 1c4ca03a629f5e8993831059599f963711a069b22f99921053f05fbc3fa021c2

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