Malicious PDF — malware analysis report

Static analysis result for SHA-256 913fc5ab7ba49d2b…

MALICIOUS

PDF

88.9 KB Created: 2021-07-20 13:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b46f3715bd9b777c4be8252c4e4c7489 SHA-1: ce8917a034d3482e2d5aba8f64e661605477d492 SHA-256: 913fc5ab7ba49d2bd3a0e4dc445b4e795a2ea111865e305cb7f04d2316cb774e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ludifrance.fr/userfiles/file/67472886942.pdf In PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/88036561844.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/86745024231.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/94508360981.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e50c34c670---39243511092.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/a9d5sm7rp0erjno9cecn4i66f1/ragigisonulewuduwabi.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/pm0g6a83nivlerv27l8orei5bo/dilazopidafimatugoro.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/c8aad20721fec4e885f74266a947c49c/dedesogetajufokubeji.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/sofifufan.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/megikodewipavejos.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/xedufasav.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609d04d221545---12287583161.pdfIn PDF document text
    • http://malifer.hu/upload/file/18316603350.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052917560093.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/bozubujip.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/34384845292.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/39681488619.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcab3e1fd3b---4783354470.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/4082b24ba67355f6150089c97c8fef5c/99658892410.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/2c79961615b54c6f05e34c844416046e/85230771976.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/todepokafedojik.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/ziwavoz.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/87662775416.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e280d347c0---fejafikojivoxan.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/16890525337.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/62235439446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=most+stable+form+of+phosphorusPDF 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_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 10660 bytes
SHA-256: 1cf8300d07c4b99e4b182e7636d7ac1f448137714943a855e02a1f0b215ac424
font_01_sfnt_off00010ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 18168 bytes
SHA-256: cbf1c069f13969268611804d43eb90dfe20a086d9c87cb766b6cb15e60bc082b
font_02_sfnt_off00013cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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