Malicious PDF — malware analysis report

Static analysis result for SHA-256 457b66db1d814c47…

MALICIOUS

PDF

70.2 KB Created: 2021-09-22 13:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 578e9ff5ae0b4e31d7de6778943ded70 SHA-1: d219489d6d03bf8969a04c42d7b71e2a0cd0f07d SHA-256: 457b66db1d814c472093b20193557b939d3d6faed159b613be28ff04d9ac7ba7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://philabc.ru/uplcv?utm_term=camera+f5+pro+apk PDF link annotation
    • http://phamtrangia.com/upload/files/debatisunarebokajiwutos.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/jovulazelelijipime.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/velofateladaxuzodepovuvu.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/70329321571.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/43845079235.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/67406640772.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/1955160295.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/dijumalejawajig.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/xumefubofamugajir.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/37339489533.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/75732549136.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16130decdbb0a7---tatomunu.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/sopeda.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/wewezajujimelasalarad.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/kizopiziluzixerotumab.pdfIn PDF document text
    • http://moneymaker-gold.de/files/38599410835.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408794df4aa---67071869496.pdfIn PDF document text
    • http://104408017.linker.tw/files/55092412665.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/gotafogag.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/vegibegepuguvej.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141be5e8c5e2---37834754872.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/polawezelemizi.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/nuraboxariguwokunajaku.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_off0000b481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB481 15596 bytes
SHA-256: 9c00553086e57add6345f0531c87ba6382986c539a652b138b2d37d33f3d3135
font_01_sfnt_off0000dc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 10268 bytes
SHA-256: 5a9c4e909dc027091b819fe2c3590a4c6f8adf370e81b9f2e0cdd73cb550bfda