Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e16f800d161e6e…

MALICIOUS

PDF

87.0 KB Created: 2021-06-28 16:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f650a9c880fecc500502bf05f9a167f0 SHA-1: 95e869a6f1fcabde9159d81a71f72e5e0b887a7c SHA-256: 70e16f800d161e6ea4f7f202ed069daf126e8551e9b5c641f8b0446890acc5a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://allytemp.ru/uplcv?utm_term=right+intertrochanteric+fracture PDF link annotation
    • https://pjkconstruction.ca/images/file/23251381762.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fdb456492---78376029432.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/d1biqp4jivh9b7nplnp82kprf6/74618836370.pdfIn PDF document text
    • https://proxus.nl/file/55552132723.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0daa9b7ad---27506714976.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a504390e407---71012112941.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/99984278039.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/92024907809.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/tujolekoberonupike.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089096a89b15---21600713943.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/9038137915.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a2f072c10---pitovoxi.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/dejazuxulekapuvuzakaj.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da5340ded8---15598792992.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/lixoribenugabesevelabe.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160705b2f57693---73482767146.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/6275673520.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/famaberikedapisuxi.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/37365747212.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b667ba512c---71825082561.pdfIn PDF document text
    • http://unityproductions.com/upload/files/xatinewefema.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/4b72992d20a06ff7726df855622d81be/wijaguvajepuribaruxere.pdfIn PDF document text
    • https://gangnampools.com/contents//files/kipofakibabobap.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_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 16960 bytes
SHA-256: 1e8780adc6edba8dcf36c000f891dfabafb050aaee95abd90c28d79d3042dfea
font_01_sfnt_off00011eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB4 10544 bytes
SHA-256: 1d2fab202f82582a264e6d8af10a46d5fd075cdf813b59d16ac6f02791720065
font_02_sfnt_off000136b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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