Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe2289bec230ad6…

MALICIOUS

PDF

72.8 KB Created: 2021-09-05 07:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4a2380a3d4ae21f55a1ff56e608a888f SHA-1: dbc890c729822bc112bd661f7a52b9c1df85bbd3 SHA-256: 1fe2289bec230ad67cd259d09f47fdc0d50ddca5c81e6f71df64b42894d5ca7a
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, likely intended to host and distribute further malicious content. The PDF itself contains no readable content, suggesting its primary purpose is to redirect users to these external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a85969bf5e5---7415596481.pdf In PDF document text
    • http://machinegroup.ru/img/outer/files/pabudebalujutu.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/677de39b726716448b67d604ce8003cb/90880284264.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/e055cf3ce1ac5c45be9f32ec6df0ff72/foborukujemuzevu.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/90030716160.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c7189b1e3---sumulib.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1181e974---24483776948.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/70946798366.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081645e464cf---zuwaxedopavinoputuzu.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/xezaluzowalazebawa.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e798146f6---92226941920.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/0c33d5af22e18e566597d72cb3204d8f/segowowubupixab.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/99337771065.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/woxikujuruneloroxapu.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/32180066976.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/nowojixe.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/gozomiloluwotes.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/sevonakopazexa.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/zokefalubakim.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/96871743666.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/nadapidamojokezivima.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3907abd47---57589581231.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/71bc64c9a9562ddb6492c932abc18e5c/71415279454.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ga3khkcj8a76hlrlmgvjse9ijs/65772265874.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/luzusaxubariwagufodudug.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/ce77fa5c48c0cbbcd4a5b071917709f2/giviligebukejazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=acrosome+reaction+pdfPDF link annotation
    • 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_off0000bcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD5 10716 bytes
SHA-256: f2e45aad679c80cde815adb06d2cdccdcf3f054fd2ee0ca4bfcbd7ace8b8304a
font_01_sfnt_off0000d56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56E 15616 bytes
SHA-256: 0ef2a4f4e352810135292afc3047aa962cd3115dcdc3c6c92e0ad5ea606f254a
font_02_sfnt_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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