Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca4e56d99a7314f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 20:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1912918a0e1c8a4b16b4c9ab8edac0be SHA-1: c285d72c77543ed432e48d5e1b0d8212496b14f8 SHA-256: fca4e56d99a7314f9ebc59d48e16f2276871428856ba02c4e858cea93f25599e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeba858b578---87310414021.pdf In PDF document text
    • https://damiel.eu/userfiles/file/wujamolinivit.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829f45c2552---21723035103.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/sosizamafesimu.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb280081122---24925848702.pdfIn PDF document text
    • https://sanagustin.cl/files/gevupalivewuwefaropigubi.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e12d5e78a---fugiluruzid.pdfIn PDF document text
    • http://runo34.ru/attachments/file/sizaxal.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab559c686b---77553817733.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/monokudoronazawokum.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/nokodalexujiramixejis.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/fn0ini0pqgho1pok1045tm9a6e/6063502991.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/96313150734.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/98113680703.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/dusukowubex.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/wuzekoxelajagamisubok.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/lozaletagoge.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/69175588466.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beec704219---42239661828.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/32230134888.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/saxabon.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/11506280488.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/luxewemepejavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=linear+programming+problems+and+solutions+with+excel+pdfPDF 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_off0000d650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 11452 bytes
SHA-256: 0179bb33db32a1d32826acd67a31d7ea1f59e9c4af736b6dd9a8f033148c1c21
font_02_sfnt_off000108e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 18160 bytes
SHA-256: 805a450c40c77822e2726e921e8334e712cd2838fba4963c691ad6f58783f694

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