Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d1ba6727d20a63…

MALICIOUS

PDF

70.0 KB Created: 2021-09-18 22:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 90ae0beea2e582a20953b68455321b7a SHA-1: 0b251a8387ab698d655fdefeb78d7abdab142850 SHA-256: 83d1ba6727d20a6382c6484d305c8c9935496f391c2bbac5d2abc9b432d0c2ac
176 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to compromised CMS uploads and disposable hosting, as well as a high ML score and ClamAV detection. The embedded URLs suggest a lure for downloading further content, likely to facilitate phishing or malware delivery. The primary IOCs are the various URLs found within the document, pointing to potentially compromised or malicious hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pachetedeturism.ro/images/files/65239616903.pdf In PDF document text
    • http://vsrru.ru/userfiles/file/rowixuzubojat.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/96805034249.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/giduxitejajoboxedosu.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/e0f8f28a6226291c71012e2c1cc6308a/mesukuvosuja.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/majuvuwiwu.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/sosuzusa.pdfPDF link annotation
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210909101403.pdfIn PDF document text
    • https://geloracinta.com/contents/files/gowuzufuwidovijozezi.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/vivapejilodudafuw.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc87c69fe2---51661322432.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/tojusar.pdfIn PDF document text
    • http://bociany.sk/media/file/vanibowedetefuvajakusume.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/65750460246.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2f06dd5e75e7394733a50c87f43dc1e2/xobetadixerekanumib.pdfIn PDF document text
    • http://urbariatprasice.sk/upload/file/13786103191.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/26769114544.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc4358d399---jozosezezog.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/xinolono.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/xitafijuwurivoxelo.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/bodal.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/30677575615.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/96400777943.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/68301317693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+nfs+most+wanted+2012+for+androidPDF 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_off0000b21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA30 15804 bytes
SHA-256: a5e3ef2fe0a0bd0b742b87a1151dc8776f3627c1f619fb7b157cc6d80b80b6c8
font_02_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 10896 bytes
SHA-256: 5f7a94ed4c76a3ab0e79ed06a40678d38e841952826a04accaa8e8bb25d43974