Malicious PDF — malware analysis report

Static analysis result for SHA-256 7390ae4a301c29a6…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 22:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 86dafa13b501b4c1c01fcdb4979b4cdc SHA-1: 3b5a67ab886dd57ceae0e7cd63d534c393571c8e SHA-256: 7390ae4a301c29a6b545ec03be74a9a2f6e6328db1f1beba6153ee4b59e382e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the presence of embedded URLs and the link farm structure are key indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=make+pdf+read+only+adobe PDF link annotation
    • http://slsnn.ru/content/file/8839406616.pdfIn PDF document text
    • http://texmet.pl/userimages/file/kotitufo.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b0d0efc3ebccf3a86a4d06fb7610b900/68887019406.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/pularegopigu.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/jozirawewapekuputirideb.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/131ea6e9bc17fa2b46644f10d8ae7b2a/jikudowikukudamobiti.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/664a76e036a1319bf2dd051c5bc6c52b/zaradavubimazowaloze.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/75307498813.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077e4cb52be7---14019266658.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df096b7672---43467070841.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea242c150c---buwowumerewibivomagaf.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ni8a5on9v01k5l4edbb5p7ch05/45112835533.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/7218d9a5f22a53c525516060871ce646/gafefojivamugipesukila.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/sogakis.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a730a8e6da8ff475d0c2e86a44c931df/88762331675.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/tomobe.pdfIn PDF document text
    • https://cooperspick.com/files/64957397982.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/67734946574.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/fekokil.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/kipodebex.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/ligumaganetozakov.pdfIn PDF document text
    • https://kaparatt.com/images/File/vimelapemegela.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/gumaxuwafenekadavosixu.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_off0000d434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 18140 bytes
SHA-256: ae250b69bd7eb449f662f3351a5faeaf6af64ab175781f8bd6c74a3475727130
font_02_sfnt_off00011b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B31 10472 bytes
SHA-256: c8ba02f7fe1a99ed5c86bde40558a24916676cf2983df07e76f18ac0667999d1

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