Malicious PDF — malware analysis report

Static analysis result for SHA-256 be73a8dc9ad12554…

MALICIOUS

PDF

95.1 KB Created: 2021-09-08 01:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1fba91ecb3ea478303783c46288718e2 SHA-1: 3ae73d50ebba904c7297487ef1dad1a132773cb5 SHA-256: be73a8dc9ad12554b6340345f79e4946822d86b4bf5aa9eefae38e3062b252a6
176 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of a QR code lure further supports a phishing or redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://accomplishtheimpossible.com/userfiles_ati/file/nexugesisikobanetubujeped.pdf In PDF document text
    • http://yuilchem.com/userData/board/file/35535210166.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/xukeridivifudomatilo.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/wiviwelamibixuxirubug.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/87230728001.pdfIn PDF document text
    • http://balone.net/_upload/file///xegimukarividotoba.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/d5srfvh586qcm2bh5mn6bqf647/luteferuzevadodibukisov.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2f8a6026a21462c71324fc6de27f430c/togijuxewe.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/vixezaribivolixedos.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d790497fc8c---wuxafoxosasetojufaganerad.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec7a69d2e5---xanilezevapef.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/tamamajejezagimuduf.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/45975361571.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/89219073872.pdfIn PDF document text
    • https://mclarenquartz.in/ci/userfiles/files/87786797301.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/feb09bfdc300431d132d4324f203eba9/64721414766.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4075b47ce8---xopinaxixavalidopupekap.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/hklggriimo5agvkse36j6c3as6/fevepusufozibadiwex.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/mavomejo.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/56194208836.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/56369217563.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210827_021230.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/98573788703.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6125c9d6f---tabegevefirizivepopinef.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/24145917140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sq9+mini+dv+camera+manuale+italianoPDF 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_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A4 10920 bytes
SHA-256: 3ef98837ec3afb20fc91fc6d30afc728f5e95ca33dc487389787eba9661fa914
font_02_sfnt_off00013bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBF 19336 bytes
SHA-256: 16a42b475dfddd3034f5068116dbac975fdec32e703370e5ad8f02fb60d420cd