Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22feecc4266dd4c…

MALICIOUS

PDF

85.3 KB Created: 2021-07-08 08:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e4fd7cfaa4eda6cd0dda317eb8c474e1 SHA-1: 68e2afceee0ce20d295134c00440b6283d869d97 SHA-256: d22feecc4266dd4c5304ac8c3cef6d258fd90b86ec4ae3979a116d3c65148aeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crewmak.ru/uplcv?utm_term=dating+while+married+stardew+valley PDF link annotation
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/90735a40a5b13faa822376d5f9301557/misema.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774c50d1746---77743836817.pdfIn PDF document text
    • https://tdsns.ru/userfiles/file/jiwogosepab.pdfIn PDF document text
    • https://invest.pl/userfiles/file/89064563458.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/nolikolakivifulaji.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/cd1a05d21a3b32715f2cf4c33c8ac61b/23965908911.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/nijejopuxozevugina.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf3afc27fd---34399952391.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/94102789436.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/65359887909.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acb466f8d4---pugirejobemikaj.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607642709a201---5811993492.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a6dd0c62f---11011664289.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945b7d2a33e---garivitusodatilu.pdfIn PDF document text
    • http://arslanemlak.com/E/file/35620690528.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/67d813adf6481d8cac9859b57b4be220/lopajugisokix.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/68081683272.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/72575206453.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/10852991834.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5c0a2dbd6ddeb0713f2b00e09f3bd473/58562015174.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/86676530014.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///9612733170.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_off0000eb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB11 10844 bytes
SHA-256: 3bb64169c43f79c1c8937d0383bca9d82ca0e5005b2ffb42d3d6f2f03ff960e7
font_01_sfnt_off000103b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B9 16920 bytes
SHA-256: e90ee25d34687b7dcfb2351c643c4e0560db01b22827ae1802a8edc68be25b23
font_02_sfnt_off00012fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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