Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9dc531d47a9f4f6…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 10:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4e0f0ce307b44e58924c19343dececb6 SHA-1: 3b34c2dc1b98952efeeaad3bf50baa848a5addab SHA-256: a9dc531d47a9f4f65228e52dbbc3e6a09599b587a094059b6988474d6211d3f5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be to lure users to malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://dobre-akce.cz/media/files/file/bisedonadirutekobamej.pdf In PDF document text
    • http://vicc.huh.hu/UserFiles/File/vodaweji.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132c47bad330---31787888404.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/98984992282.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/53292130902.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/gopitowegimidew.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/dexakegopapaf.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce43ca98dc---nemuba.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161343c74e40a7---16085277202.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/zosorijamogivuwimiroxuv.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300efda6e8b---zesewilirusexalopotavuti.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/50853344845.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/serapadilokekapotodovinuf.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/36836449037.pdfIn PDF document text
    • http://www.cabinet-pollet-lille.fr/img/uploaded/file/tatorizetiju.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/jawakadugasusosujinet.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/lowodofe.pdfIn PDF document text
    • https://okazionche.com/files/vugotetidixafanebiw.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/wopene.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/jomeda.pdfIn PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///202191982569470.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/75f044af1e98245e57c1076591507637/gujukuverilakadub.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/84604502036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=world+map+with+latitude+and+longitude+hdPDF 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_off0000b116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB116 15864 bytes
SHA-256: 3ff0e3316069be92305e75ab11a255fd5600a71c22321261f297fc0215ef6ead
font_01_sfnt_off0000d7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CE 10852 bytes
SHA-256: 5a89956597f2f9357a80274a49e780945491ea879b3361d3fc3fbbe94602c12c
font_02_sfnt_off0000f073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.