Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8a96cb012c10bd…

MALICIOUS

PDF

78.3 KB Created: 2021-07-05 21:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: eca565aca467dae2b4eb306b3d446b78 SHA-1: ee0629009829716f101ae1766b7945f5f2899bfc SHA-256: 6c8a96cb012c10bda534b713d58d248b4c83dc08a4dfa99ed8ae0f8984702b0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm. The `utm_term` parameter in one URL indicates a potential phishing lure related to educational materials. No scripts were extracted, but the presence of multiple external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://inwebjor.ru/uplcv?utm_term=9th+class+computer+book+in+english+pdf PDF link annotation
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/novajinidebozafalulir.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160906a2f81d54---rijiniluveba.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/0d35f631a0adebd260c87c7f0f4547be/29388930608.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfba0d964f3---dukimagabenifiwimugumid.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/riwixut.pdfIn PDF document text
    • http://www.asslar.de/downloads/tifege.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16094564b77a11---23390442643.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a95cb223837---xemetu.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ae004579bb3---34033327484.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/61771756071.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/92069079944.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/76007286916.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e10fe1aeb30afaa179da4691df69ebc1/kawifazuri.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607be96f445f0---76284072022.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/fewavanoduzapo.pdfIn PDF document text
    • http://alkanboya.com/files/file///42724502343.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160736c1bc2a33---rodapemibonanijul.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4adaa1f1c2---vilujugikoromuduloje.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/damazuzapizigepuzajituj.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/kopurolezoxegeb.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/1b071debf7e90b68917aa216bf2c0a6b/xuvinuxujosazubamisezop.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/lusiradan.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9afe3b8ad0a3848bae6a73a73db735ab/99971908890.pdfIn PDF document text
    • 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_off0000cdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD9 11472 bytes
SHA-256: d7d70f312343155aaf6a208499ffde50ab3f0d9ac9f4d24b28dfb7e757973d92
font_01_sfnt_off0000e85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10071 16644 bytes
SHA-256: cfcfa6e85890afb510ac585e0c975be914bd3713ff0161bba401fd15e542cdf1

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