Malicious PDF — malware analysis report

Static analysis result for SHA-256 df795cf18ac63cb6…

MALICIOUS

PDF

89.0 KB Created: 2021-08-17 09:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b27733301e8e0d705719a311b4c1f6b9 SHA-1: f1f713be5e1495c978d6b48da41933aa5f96c711 SHA-256: df795cf18ac63cb65fed18e51c13179ee2a803bbbd3012dbc79f56b575336e0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160949a1269a73---28297703544.pdf In PDF document text
    • http://ahsaipu.com/v15/Upload/file/20215121124535363.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2268eeea41---89482354940.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/377c40f2c1944fbae40cd7b13e5adedb/43440634728.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/bbb58bd72203d816204c7cde902bd7b7/jedeka.pdfIn PDF document text
    • http://intertribo.sk/files/77375250171.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/56880956011.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e20e395e---jamuwizuna.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04725e9da5---mobigulilojasew.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021081007532518.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/55581514979.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/ru74shvon8og38n4lb038qptg2/julidaxapefip.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071494c0bde4---bibivijadivodaveguzesizi.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/givadusivemuwuvo.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/54476934535.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b5adbf1aac2---nuwijadet.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/2185e8b55487a57cbaea0125c01d20a2/45892089567.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/87247121820.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/25bfec4be11eafce98aaabe7a313b202/91522461118.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/zoroduferumudopemubif.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/81693477304.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/c7880d2f08221c4ffc0d6f6f3cbc0757/lixiruzijotoxupineze.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160856b075c198---1906230736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+fill+out+a+30+day+eviction+noticePDF 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_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 10852 bytes
SHA-256: 3e2ac3d36a4d7c1167b4b4e0c6741bb429e914cccdefb8d2f3a9822ac08f760d
font_01_sfnt_off00011382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11382 16412 bytes
SHA-256: 80a84576f40e64906b1b0f0ceea1dec8dcedf623cd8e8737369f1fc3fd93efea
font_02_sfnt_off00013e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1