Malicious PDF — malware analysis report

Static analysis result for SHA-256 967b4dbae74e37a4…

MALICIOUS

PDF

84.9 KB Created: 2021-09-05 08:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ea5d76b52e2e9cdc9401d04a0abc91b SHA-1: 499a596e26cdc4888d97b0576986710efc78e76d SHA-256: 967b4dbae74e37a489f1d9c40fd3bbdff8f0b6fed4901fb460b48590789f19fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. No scripts were extracted, but the presence of numerous external links indicates the primary attack vector is likely directing users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160dbff2d93c59---buxixofogeso.pdf In PDF document text
    • http://kaithompson.com/userfiles/file/gonuxepisibik.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/80996277334.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/89705217875.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/gezelajatikap.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/2d93484ce29ac7417b040d62d1348ba2/gutonu.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbec131f43---tudivawezozizepuxan.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/63433219058.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/goxasumobaxuwa.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/dedejipinasubow.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/kogiwesipadidadofu.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9b917d9d5---dejokovuxinemigoxuzirom.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210902100813.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915b699cb27---19906763957.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0060e8067---boferinanek.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/24076786425.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/wifabipuj.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/9d5238ac74f62c093282d51e465ef6ff/xekugijevijiwizom.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16303615931973464779.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ghs0blq8rerpa78dhn138mf4mj/68796624287.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/j57bgoveulls30jdt9kemvb996/79667196452.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090548b4d6d8---44519141826.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/72622407150.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/kikili.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/77469887987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=health+promotion+programs+planning+implementing+%26+evaluating+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_off0000e587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9E 10692 bytes
SHA-256: 0ae5b9c0819737d90bcf145e8cc8048a09704d3f5abbd5a9aee2f8fc12d24457
font_02_sfnt_off000115de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DE 18136 bytes
SHA-256: 971887837e2cdbcbf79cb761577c976a8e22b568d91425462797808423ffd15e

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