Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efd08994dade91e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 21:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1027d94e4ab3cb9598e8f89bdccc04bd SHA-1: b8d014d5e493031aed63515dba09e2a22d564f63 SHA-256: 1efd08994dade91e1c4e742ae4b8a1d3250aef12de5d029443390699ee8c81c9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, with many links pointing to disposable hosting or compromised CMS uploads. The primary function appears to be directing users to potentially harmful websites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=reface+apk+full+version+free+download PDF link annotation
    • http://446888.top/userfiles/file/484381628.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/zupobapipofixosudelo.pdfIn PDF document text
    • https://ms01bet.com/contents/files/74396257072.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161422f3e026c2---jafubiwufisiwe.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/zatibibokifiwepa.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/rikomo.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/51163782153.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/wozeforerowe.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4414e333---49162970786.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/dasanoxadofufu.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/86430749002.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/90762780734.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/badirojofurag.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131a36eba2e1---23821128730.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/85205767064.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210910151124_wgo30m.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/bomowuzogozepitogonudim.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/webunevovin.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/63826663439.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/10825734800.pdfIn PDF document text
    • http://dolonchem.com/upload/files/13964633175.pdfIn PDF document text
    • https://anup.bo/images/files/48167168499.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613743f007aa6---53299012950.pdfIn PDF document text
    • http://inercial.es/uploads/files/54555027868.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/xobafatenapoli.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_off0000dd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7E 17840 bytes
SHA-256: c6b4a4d33ef47b319bd7a1c2a8c0e1740a70785af0b4f7b47ffdcb890541582f
font_01_sfnt_off00010b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B2 10904 bytes
SHA-256: 0ce1ed70cbe737377465c969ea0ceedd0d535b4ff6f2628b1483f64b599c8402

Open this report in the interactive analyzer, or submit your own file for analysis.