Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb784baccc2b2e4…

MALICIOUS

PDF

99.7 KB Created: 2021-09-01 15:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9b0789bd98f3d393738569895ee2a48d SHA-1: 65be8afde231021d9bee892ffcd28f893ad01a04 SHA-256: adb784baccc2b2e4acb071949263ffb4887b68f01235deceef76614b8b5df407
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=how+to+delete+1+page+from+pdf PDF link annotation
    • http://ossokahve.com/upload/file/51324015127.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/52578631083.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae59d52a9a0---12302987947.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/dovekuriba.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/nurufuxavifa.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/20396491952.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/poroluxisiwotomo.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161218d56cdad2---99994029594.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/sovuvotaxodinezigeg.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/54885384143.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/jrfibcbf9njc87kheap4d1lodi/fexapuganuzalitofogesetu.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210627_5E194899CB0BB9B5.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/tavupazerunuziloda.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/66774467939.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/76282290072.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/29870a0bc87da14344e13ebdbfd1b38d/girixokopepujebajinurebex.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/gefakalaxakalijug.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/suxekoma.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/59929406408.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d8e0c54da---91258466434.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/era9en7frk38tpch8thepba9e8/34742747868.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///numenolobudujuju.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/85999000560.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_off00011d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D29 19400 bytes
SHA-256: b4cb9499bc9c06ee82b2e1b5719ecd78b326f318f475a3fbd2d472113a17bc11
font_01_sfnt_off00014faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FAF 10608 bytes
SHA-256: ad14768915d5b3b943215d279b835fe0d11b068814bff08f836c2efd6a3c9eac
font_02_sfnt_off000167d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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