Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f139c01eb714ee7…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 13:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1956cfb92d9f3e24fffb4caad6ba37a SHA-1: 5a80aff346f88d49322f775c16a4e5675b1c9b54 SHA-256: 5f139c01eb714ee736145a0a7aa9c737f5bcfc42b1c0898247bea7bff6c5017b
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links to potentially compromised websites, many of which host PDF files. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document likely instructs the user to install or connect with a remote-support tool, a common tactic for gaining unauthorized access. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics suggest a phishing or social engineering attack aimed at facilitating further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://elmaga.lt/components/com_mijoshop/opencart/image/data/files/fetisadonazux.pdf In PDF document text
    • http://wwpokebar.com/uploads/files/48880791596.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/9715117407.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/16586607276.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/77365595316.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/44918539067.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/xewejinosesirem.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/difegojup.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/50691343323.pdfIn PDF document text
    • http://gardatrans.com/content/Files/xavazalanoziredavuf.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/60132681429.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161420be1d23ff---48517430230.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/2764288897.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/durevigubojekun.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/76230856002.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/5474573691.pdfIn PDF document text
    • http://scsychem.com/upload/files/12917427843.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/19700053514.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146049ee45e8---39286906891.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f606934fd6---57583620176.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/56696068374.pdfIn PDF document text
    • http://trivio.it/userfiles/files/nuturarowefesedapemuwo.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/38100794442.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/sowikovatozetudiven.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/nesit.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/59956000080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=remote+from+phone+to+pcPDF 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_off0000e4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 18028 bytes
SHA-256: e424386d1e057c754755d36e49169666efa1ed5ec716e8b6a5d77e8ff57fa5fe
font_01_sfnt_off00011390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA7 10320 bytes
SHA-256: ab954f37f570d7fa4c33176d8649536378b8c60c7285c367fc2c562ed50abb37