Malicious PDF — malware analysis report

Static analysis result for SHA-256 705f871760f2e35e…

MALICIOUS

PDF

78.2 KB Created: 2021-09-05 09:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e56c4aec068f061c36646cc5f0e91c49 SHA-1: 9a984e1a9ef12c181d057b660cb4e6c983cae4f6 SHA-256: 705f871760f2e35e27bbff573a2b58bae8abd3252ec2b589f0855242dee6d6db
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier. It contains numerous links to potentially compromised WordPress upload directories and disposable hosting, suggesting a link farm for distributing malicious content. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a shell, a common tactic for executing downloaded payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://aaronandanthony.com/userfiles/files/liferilapiza.pdf In PDF document text
    • https://alyosserspneed.com/userfiles/files/nobibaludidagoz.pdfIn PDF document text
    • https://filetorme.com/upload/files/luwudaxurezojunonodedeb.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bb94fa7f1a7---52503997304.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/c5cb05441c03588c92ca247a0fb2a43a/lelamitegivozubofejagu.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/22584933781.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/22937799949.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3ea25750c---tumovu.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/7b0e0b49d2bbab0ae2e1aa10a0593b68/99957211810.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/vewukosedisudes.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/sujiwerewixunazazu.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160759597e264e---konetofezawonexajosukimi.pdfIn PDF document text
    • https://successalpha.team/upload/files/77397690842.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec33d92765---64196155178.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/xaxasirewilazo.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/dofigerikasolanexutudime.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/84953629302.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1849a42a7e---kelarepob.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/65635800495.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608545c6c2ce8---19696823242.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/14dab304e02847d152beb63110d9a949/vinolemo.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/kokadirikubisejini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=h%C3%A9maturie+p%C3%A9diatrie+pdfPDF 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_off0000c581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD93 21296 bytes
SHA-256: afcb99a813c05d5b16d152b39bcbe9c4ca48150fc6e4d5f20d0b925049619cff
font_02_sfnt_off00011243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11243 10468 bytes
SHA-256: 335a9934f8d982cc9cf120aa4b95903a447affe05f2a7b3d625b301fe5568fa2

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