Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64a7084b547bf9f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 22:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: deb97697ae20542dd568210a00cb1762 SHA-1: 04af1c6b365222301bc1b1b94f39ba1d59a47535 SHA-256: a64a7084b547bf9ffc86f2271b5c4336a8a3142c5a5e8efdb47bab2b6b49fb52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://nomylo.ru/uplcv?utm_term=malayalam+tv+news+live+channels PDF link annotation
    • https://fceresources.com/ckfinder/userfiles/files/60740510998.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/34196139806.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/6479194341.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/kifupis.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138be35043fe---lakinuwivimumer.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/zidagezeraxilobujonozeviw.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/41762931490.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161419f73bd4ee---46186060875.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/xapob.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/78836906806.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/fuvezekonojeg.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfd7f64176---99411281100.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/bewonewovomuxajofasu.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/vipelirafizekugenomovu.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/jonidibozutefagafotenami.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/supazu.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/61678454708.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/buvuvi.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/tawapuxejovi.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/pifizibivafonelezux.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/xujedizizoxegawu.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/tiwuzisirerago.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/20711885644.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b43325104---dilupezubuxobivegel.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/gajuvukijir.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/70752894797.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431ce1cf1e8---xajetolutigozubug.pdfIn PDF document text
    • 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_off0000de0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 17428 bytes
SHA-256: d139f74c4f5bbb91492f42cb56fcba1156d98f63f18fa46646b63ac84687dc2b
font_01_sfnt_off00010af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001230a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230A 10536 bytes
SHA-256: f433b53ce4f567765c1b5b0742c2e12545be9d8be35dfcc8397098a24665dc1e

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