Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd6190db4690b93…

MALICIOUS

PDF

97.2 KB Created: 2021-07-16 05:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b2da8f5ef6c75ad503442c7152b428d8 SHA-1: 681a2401d7dbb57bddfaba279f4785511fcb7532 SHA-256: fdd6190db4690b93e33c96a7c05060457b96ed4ed52f365c23efaeb1808f1a68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. This pattern suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ee567d4b6da---vikejewigovujabiserib.pdf In PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/74101482870.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/70807199480.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/etjbqrrfhf2845d584og2jahf5/jetogukeba.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae64ae391d7---nifepi.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/f6b20c05e182b6d47e32b93f7321f399/96816824575.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/3f902j3hc3jp78bimdcukdn045/39379698948.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec3c98b5a7---300517336.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/e9694b9b3cca64309abef2516a3af957/lisemimig.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/regumumokugakumebefap.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/9trjshgpcur656pdgksald9762/duworazoxogomo.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ca9e21582ee235e0dd213f29e411261e/relijiwuxusiv.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/selutitesefinate.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/a8aea041b832c639d426120d8f65ffb5/namobipikudozidagaj.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/96024715184.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/jerosulatuvexokojevor.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/xikosojokezodib.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/pidasowisijidoto.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4e8cc9b82f3fae50be583c8a5e545ec1/17509575373.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/15576827714.pdfIn PDF document text
    • http://dade666.com/userfiles/202106file/2021060915111170554.pdfIn PDF document text
    • https://cargobull.cz/res/file/90211779678.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/0i2rr3nfpajgt2ko11b0fpem61/dadazanokogabenez.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160774907411f3---xukalodubuzijiju.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/22f58428ef03ebc42ea298a629ce70fb/muributovobejolarufix.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/63e472bdb88a73e861f2923464e6eb02/putezevazibemirewexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=scapulo+humeral+dystrophyPDF 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_off000115df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DF 18196 bytes
SHA-256: 07251df0a7cca5adb0bb5a79e4de161adf99bbabd0168c8d39df43dbcc70276f
font_01_sfnt_off000144f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F7 10872 bytes
SHA-256: fe1ecbd62eabfdb281d4bc54f312055270bc428e753c4144e75127cdbf733802
font_02_sfnt_off00015e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1