Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff914ff1ee6007c…

MALICIOUS

PDF

72.0 KB Created: 2021-09-05 12:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c540bdda7f61f2b326f6c059638db71a SHA-1: ce024cbdce77c7b3eab5c78b01c4c5f01769c338 SHA-256: cff914ff1ee6007c13405bd906c252b6d457c9f4449a7ea69d37b73c879913cf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and disposable hosting sites. These links likely serve to redirect users to phishing sites or download further malicious payloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://oniceh.ru/uplcv?utm_term=download+khutbah+idul+fitri+2018+pdf PDF link annotation
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/6g0uh73ivdp34bvt308p86otc0/lajilatosax.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/basomojodajopoxi.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/torafokiwuruxitewal.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/miripigizumufufatanoro.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607831afd0d09---tiwovijevavekov.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9ad6a3b30---61820235607.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/dha7l6vc91ies2duv7b0hv6lph/52752108765.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/99034896287.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611e0787c2358---1370195697.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dbeee1a9a79---64560766425.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/29792829076.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/kakoza.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/tozowuwaf.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1dd27cd44---21838159941.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160944538dfa44---rejuter.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/d33feb83f9b226a34a48eb8ff78daca4/125687334.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/59637160964.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/sunipesomu.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/67207231267.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/koxifibidi.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/wujoxifuzovupedibuj.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/gunopaloturija.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_off0000b4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EC 16796 bytes
SHA-256: a5e5757161965c66c03e271eade1291c7c83cb27e8b9798c5abe4b3973b03114
font_01_sfnt_off0000dff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 11216 bytes
SHA-256: 4a780f848e8c5b1e93e30c29e1877dcff42e28428ac663710023b0b58c7bd13d
font_02_sfnt_off0000fa06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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