Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1126575f87429e7…

MALICIOUS

PDF

89.5 KB Created: 2021-06-28 16:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7936bd5b83b33dc39d16900b1f33ad71 SHA-1: 3cdbbb0677c8f85c6f7917a80a81d94058c06ab9 SHA-256: c1126575f87429e7154e43bd9e6499f5f28289a28c6c3ebb67c4970ba1609de2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm directing to numerous compromised websites, as indicated by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure points to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://benevolo.it/userfiles/files/lijili.pdf In PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/72d65e28ad3a6b20a7f557c3b34d13f4/kuxuwifizu.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/26311325623.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/25481910184.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/iv7fu2igm7nl26idt7pgibpac4/nunesezoduvabolobe.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/14343294966.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82fd170c2a---54911282143.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/81bdd378b1bef1f186c3ad32f20fbe43/kerepebo.pdfIn PDF document text
    • http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/vijivogosulefaxila.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/3072765910.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081417673ccc---27336165571.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/josowatepegejijiboxuse.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/e47455cf10d619f3a8eefea52719e0fe/gufaropedatejegim.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/gvla4k6v9jd07g6jc5787co3s2/13024705021.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/54905022703.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a2351d34098dc00747013b461c66ae69/xekogi.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/4946cae21644d6a4d1580439d2f2672d/kufonev.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f837d87970---17832314153.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///92975995308.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881df8a0eb2---72475786844.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/bevawav.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/50059564029.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/zazanonegowo.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/ae0c69d93e00d729385833323584177f/70674568864.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/69361993334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=average+speed+of+a+jet+airlinerPDF 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_off0000f9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 17464 bytes
SHA-256: 204801678d4db363736a880774a278569e3e5e5a1beda77bc6cb1878e2328b37
font_01_sfnt_off00012795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAC 10852 bytes
SHA-256: bb8ce9c1dd4dfc513186bb280ead0828cf1c033c8f9cf8430d69f97bbd78b7d0

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