Malicious PDF — malware analysis report

Static analysis result for SHA-256 04121663e68ab1d3…

MALICIOUS

PDF

90.3 KB Created: 2021-08-04 08:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cc3584529c509e94e6052587f94d7621 SHA-1: 0ca94ec298d3297485d05f9e123e62be890f8c52 SHA-256: 04121663e68ab1d3f9aba0777a953999270a4f755a511f87cb6b5aecb0fded66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://askisan.com/upload/ckfinder/files/93903660962.pdf In PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/7af2d7522f4851d2228aa96003a7dc63/11749470102.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f74b97e3b8---13271676432.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/cf63f2c47cc6bbd3971fdbd99a5332ff/33327202127.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/momedinipitobobopotekarer.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ec116fc13ee059fd25c945f2af7c02d/lakonamik.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/62970474363.pdfIn PDF document text
    • https://baglab.pl/galeria/file/genato.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/88775443948.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/69790341636.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/33288911448.pdfIn PDF document text
    • https://airshow-bg.com/file/82524216363.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c74a3120bd---64129349495.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/1d492ea69fb4f255f0e21fe895dce190/93929679840.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/15367192664.pdfIn PDF document text
    • http://juliesfundforkids.com/clients/d/d6/d6f17a7a4e9d342a12f8f8eeddb80b2d/File/30958155875.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/1333734ebd7984d1a3685d2bf5d5b02b/bedegixebo.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32a9818d3---87728641087.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/48109027607.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c658710f4c---jemabenuxexoka.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/sunexoketadeduz.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc5fa6d33---16643731957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mixed+tenses+present+past+future+exercises+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_off0000f9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FA 18908 bytes
SHA-256: d5455e38bbc3ba8aef93509039565edd492e418c4cd913974dd6f196926a94e1
font_02_sfnt_off000142b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B4 10644 bytes
SHA-256: 3297a793f8790e0b7d20150f746fbeb02c109260cd5bd998f2eaae3732a2bacf

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