Malicious PDF — malware analysis report

Static analysis result for SHA-256 24406e5996883ac0…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 10:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb80bfb6f4977baf5d69c5b1d9980692 SHA-1: 6271f25d0ac11de41a59a705a3ed5315529c8a33 SHA-256: 24406e5996883ac0bf809d6a83c5ecfe72d66ba680889fb14aa28595f7372b3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/uplcv?utm_term=space+shuttle+mission+2007
    • http://bjhtdszdh.com/v15/Upload/file/202151338164166.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/lef4q7qohrb91vekiskrli3ljs/pemirujugo.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d877ca0b02---kubonexikudizitufevos.pdf
    • http://tugrabilgisayar.net/resimler/files/88864098262.pdf
    • http://global-insurance-broker.de/downloads/22827885179.pdf
    • http://mpu-beratung-brendle.de/userfiles/file/sulajamimuxuvoripubazo.pdf
    • http://stonebriarranch.com/clients/876969/File/fedezofopofexunulub.pdf
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/69353009727.pdf
    • http://alanaf.ru/userfiles/files/76583055210.pdf
    • https://wolfgang-photography.com/userfiles/files/morutoweludafo.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/u92auoifgap70i135n43ahrnn2/sabipudewurawedenita.pdf
    • http://cravaluos.com/ckfinder/userfiles/files/73036751406.pdf
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/kodaxutakodagarogoj.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b06006460f3---38284312698.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611541e31d003---giwetutuvifopusomaviz.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/15115750615.pdf
    • http://miryangpension.com/FileData/ckfinder/files/20210707_B3C7D2DB1B75F6B8.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/afa8b56c74b2a0141d4def0a6c0bc45a/babufiw.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10caa98956---1052287327.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/62a52jtqohoh1eq2r8m8lebogg/rezigalibotilazob.pdf
    • http://hangquangauto.com/files/nelavu.pdf
    • http://pusancard.com/userData/board/file/fezulupifixonelitepemogud.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 16792 bytes
font_01_sfnt_off0000f63e.bin
0d3d99b70e16c28220c452783ea54f87723f4b55015eb8a7422c9d107402f823
pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 11004 bytes
font_02_sfnt_off00010fb2.bin
267becc7c56424d315a7bc6e948bdcf8e43228f0f526c5010b368d5672be9668
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB2 18916 bytes