Malicious PDF — malware analysis report

Static analysis result for SHA-256 884f0171675c658c…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 14:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 32b54399795b96f5511c3104e5cc08aa SHA-1: be78ef9f08ea6d9dff5634d1124ade7cbdc080cc SHA-256: 884f0171675c658c191bb08f77aa284d80fc9085571848c1d6da52debf6ad3da
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://anaksemut.com/contents//files/dovikazidefiveb.pdf In PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/gegebexakejekes.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16086d37460e8f---buselomaretuposako.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/68654309636.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/zasedatato.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/20935355649.pdfIn PDF document text
    • https://samowar.ch/upload/file/lavago.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/98813103518.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/rulofisunimap.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/64825994279.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/xekosozopuwagojasev.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/bajulexokasevaxipev.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/65338746252.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/wivodoxezusefajovuxemu.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/getubetivopewupig.pdfIn PDF document text
    • http://gtshotel.it/images/file/gijanaserutixulusiv.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/bff552556afb7c439bb59709e8b5f7e7/rozodelapulilemepajevun.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/patesufanigotizizediminuz.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/1853268123.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/0166b30be87a961e8ae6b828269e4d56/kubixaruvoremesuxapip.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/1176184843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=wifi+router+configuration+step+by+step+pdfPDF 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_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A7 17552 bytes
SHA-256: 5be30d268f6d89791b4bcfadfe6259d82a5f63b791ceb9ad060fcfd18b22c006
font_02_sfnt_off00012080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12080 11096 bytes
SHA-256: d3ae8b745be8728b54ab2445e56c567407080fbb6330a4ed79dd2e0d10a3e928