Malicious PDF — malware analysis report

Static analysis result for SHA-256 776785ac9fcdda72…

MALICIOUS

PDF

128.4 KB Created: 2021-07-06 14:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 67d23bcf92f583ab08f672318c62c34d SHA-1: d3da9fd71572693bea2853abc4eacd26eb065482 SHA-256: 776785ac9fcdda727cee98456920a9edc28e7737c5746eb87cb0abaab8ab8784
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a tactic to host malicious content or redirect users to phishing sites. The embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/15a3fec5bc0aaf0f7bdb2d025aa9bc88/3242684418.pdf In PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e10308d14---dolanewotonibojerutijezem.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/49559390579.pdfIn PDF document text
    • http://vishalaholidays.com/ckfinder/userfiles/files/pogesaduniliminulukaxad.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/pixuduzakaduzup.pdfIn PDF document text
    • http://isvpro.com/custom/files/ledepovawemokofaxe.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/71241476174.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/7dbc33da7ad97242043d87c3f9c14cee/migowexi.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b5e8bd758---nonejajudugedepuvujis.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/2nhj0cik48k7s3c81jjnu0mpfe/pepuzutozuvavinenibew.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4bc0ed0ca---1822582995.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/58095058777.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf41996c851---48400622633.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebc1365398---48281831530.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e053eaf260e31703443a259bb1b5b5d0/55762742048.pdfIn PDF document text
    • https://samtee.com/admin/images/file/29043826951.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/79907237045.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/vobaseziwuzelapibo.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/30bcc24deb484c4be316c29eac223aa0/23201920541.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5763c75c72---85175674066.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/fccd1f9585318c02abb9da973e88e8fe/nupikofinexa.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b135ec91c90---sirinaforiset.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/fdceb13f8f43ebf3fea8ede4c94d0c5a/potadudojujawug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=character+of+marlow+in+heart+of+darknessPDF 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_off0001919b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1919B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9B2 10948 bytes
SHA-256: f6ebf4d505a6e60c6ca12e4e2b213f2284d62f1962704c73d9ec41ca3e93344d
font_02_sfnt_off0001c2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2FB 19348 bytes
SHA-256: 0cdd2cb444b344b4c18dfffa3879b73eafd4da2e8f15a73d6b3bc318ff24648b

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