Malicious PDF — malware analysis report

Static analysis result for SHA-256 838885a2101e8746…

MALICIOUS

PDF

87.3 KB Created: 2021-07-01 11:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ea409da71f136dfec5d0e3f1d64e0659 SHA-1: ab236aa370a2237c59e60f43ccacfa0295d61dd8 SHA-256: 838885a2101e8746f86095fe2db6f58553b76923cda91a997e1e009eaf098375
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple heuristics indicating it is a phishing lure, specifically requesting recovery secrets or private keys. It also includes numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://coretry.ru/uplcv?utm_term=network+security+powerpoint PDF link annotation
    • http://jiangsutravel.kr/userfiles/files/20210614_215337.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090783f3e8b4---87581407137.pdfIn PDF document text
    • http://brukbet.com/user_images/file/jeruwewiposulixejifebitof.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/vejite.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/fipigepalat.pdfIn PDF document text
    • https://emmaushuis.org/pages/85879971582.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/jibononofexede.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/hj8fe0mags66ubul1nv47i9hm2/mipuvelefamuxopiwofevasal.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d022228083---jowobemixifapumakalexen.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cd94629b8---dikojidixakiwosanupa.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/3aa09ea9c19bf4a587ea890d742897b5/73829983842.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ee2eac99abd53fb168c66b8d8cfe96d4/napobowatozibufiwalirok.pdfIn PDF document text
    • https://airbays.com/userfiles/file/jitavixeguketisoxixow.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd39255b9b6---xivadumasa.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c72f7280bc7d9be180919068c031e9bd/purosiwifaselodikabotuk.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/76364497801.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/52828390683.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/q5ki6ahm4hs0c0n8cs06mmine1/26536604596.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/78109751641.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160817ea818b7d---41232315988.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106180938551203.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/10qrff36c5hm21ql5lbjfp807m/gevunapiwefur.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/zedapaxamo.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd3aaa296b---68913147311.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 17248 bytes
SHA-256: 55f6fea10ed91b3a2f0e23338137c2530fbdd7ff998903b3a71f0de1ebb97f9c
font_01_sfnt_off00011e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13644 10528 bytes
SHA-256: 87678e33be967ff1e983c4da788dd14f2c4d3e8c779813a79e0460ec29b13525

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