Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6ee10180af2329…

MALICIOUS

PDF

85.3 KB Created: 2021-09-04 12:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2904b4c498a4b9dd389b229c245f322b SHA-1: fcb814d4b46970ccd329984ebc3734c9c4d43021 SHA-256: cb6ee10180af232983ae2965f261beec8b5e57735add4357c3ea85812ac272d1
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to various websites, many of which appear to be compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload by masquerading as a free grammar book. No scripts were extracted, but the presence of multiple malicious URIs and the overall structure points to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=free+download+english+grammar+book+pdf+saifurs PDF link annotation
    • http://grafichesirio.com/userfiles/files/90080980791.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/wonojegusubotunuvupafepiz.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210716_050258.pdfPDF link annotation
    • http://files.ibiza-ferien.de/file/82428835466.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/93602366702.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/16131490967.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/45291083508.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609188dcd7d8a---60818641287.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075366c4ac06---zeximomunefululov.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e2983b76f---fagogipuluxapezikutig.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb3a261a14---tatamujapupoliruzara.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/72ba9d8cc435193aab792061fbf6e868/43183769542.pdfIn PDF document text
    • http://oodow.cn/upload/file/2107050347264671806axzsusgccz5.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073855ccf4c4---73264697091.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/vitiludud.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///sibufobaxok.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/55854284655.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d692386b17---47489456601.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/zekezedakigesozofoti.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/vekepodepudigifoxa.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/ratujezomodigupi.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/wajilutisofepajokiwafa.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a60e737e7---82141600057.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_off0000de50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 21004 bytes
SHA-256: 5ade9e1af7fb8d44821395c33e1878d0870339aa46d773a116c5935553077380
font_02_sfnt_off00012e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E15 11240 bytes
SHA-256: 717ee4de533492df67fbcd285ec91c7e80da21eef0212b1b965f35c73d25280c

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