Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22f713fda261e94…

MALICIOUS

PDF

90.6 KB Created: 2021-09-24 09:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4cd1e182a49b613811ddce45bc901a74 SHA-1: a9f33888509aafa24ca1b6b99ca6463343813723 SHA-256: d22f713fda261e9451f89f35522ce02c441241686e3d6083293f9c239a566e74
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tierlistei.ch/downloads/92737052146.pdf In PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491531b051e---54684113934.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca7fc3e1ec---dokobufutep.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/zovugefekadevegedobepe.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/5023087139.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/zakesikobibugimuvesomofu.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613969a6b6e5b---fugulepizafipox.pdfIn PDF document text
    • http://cartopack.be/Images/file/1604457069.pdfIn PDF document text
    • http://freetds.net/userfiles/file/gojorosugibopedamowusi.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/vewadud.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1900738003613483e5716b5.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/jitoze.pdfIn PDF document text
    • http://teplospectr.ru/images/files/bivulawu.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/tojesujajoloxenadiko.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/bonutufipovekir.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/82574525403.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/73380734874.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/36762927063.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/defof.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/xetixomawanibe.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/bexipalod.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/30307914296.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/sasevux.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614441c670831---navafizetiminilavonepena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=facebook+pc+version+on+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_off0000fdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 10640 bytes
SHA-256: 0809f55cefed1d9a76b8c52a7b188dd69957fd12976f878037c510e2f703e5a1
font_01_sfnt_off0001161d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161D 18124 bytes
SHA-256: 2a76591bec04a2b9f157c154940d2c9eef290ceb40fb507e415e911715a953cf
font_02_sfnt_off00014489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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