Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb1a2880013064a…

MALICIOUS

PDF

83.0 KB Created: 2021-07-30 07:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91b1a5f054c3eafdf8bac0d32192fa29 SHA-1: 22d721fe721c6013768cbcd40d14a160cb2ec6ee SHA-256: cfb1a2880013064a0aed3849a56d3a3c02be7525bece67e4bf0aa50e6d5a4607
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or domains that appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for SEO manipulation or to direct users to phishing or malware sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://uticachemical.com/files/upload/files/jimixevonolikuxawixepu.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0412ee8521---nawaxozevakudaf.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/41912348d43c8610e85a60b96430d6a2/51596234254.pdfIn PDF document text
    • http://superpart.com/files/63271981996.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecbb2e38a2---pibuwadov.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/84967046546.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/setafezijirasusedad.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/63757966312.pdfIn PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/siniv.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/41170521131.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4139c558f9---livuxu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee729453779---13362510819.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/55586199950.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/36333228484.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/94329838548.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/kerasefujiguwuboja.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/960a61c40de8203a9fdbff1c6ef5818e/kulivepezofajolon.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5185503f8---68279047490.pdfIn PDF document text
    • http://darienhigh70.com/clients/878490/File/fuwezaxanorivenadosiwamo.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3fab9d2562b2d7ca455ac5be003418bb/jivibukiratexaxipaz.pdfIn PDF document text
    • http://brlairport.com/images/file/37619995887.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/soebhn0dk6k2km0l0106di0onl/61311932114.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/51061936407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+advertise+small+businessPDF 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_off0000e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 16164 bytes
SHA-256: 336b03a2cf3151c5fc40a62b5d763695630ef76f25df1970913d78d67491ab21
font_02_sfnt_off0001248e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248E 10792 bytes
SHA-256: 7132a4e8760e1bee3a652b3cd1d7277375579a44c9994b6cb0cf52224a5d851a

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