Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c1da05628584e8…

MALICIOUS

PDF

74.3 KB Created: 2021-09-06 11:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 71628362f9905420f5ae2d3cb34a6f26 SHA-1: b977c394bea5e20748ba614be52c216df6c04c4a SHA-256: 82c1da05628584e82dc788f7e502a691916540d2a12ced4ae8132ef8723903d1
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/k95n73s8ffckccgbpfcisq3185/doruzonifumipesi.pdf In PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0479fffab654929974a7a5eacfd364d5/girofugunenaweworekem.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/1a6203319bb0d1bf29f18424c7f2178b/gogomekaguvevaraxe.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9d2566bf---sanaket.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fe15d48b1---22308734721.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/gudemurilamumareraw.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776df071385---61657597154.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/vebigusogevawijefanebeli.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/fenazetaraguriroxe.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161045cdbe3c6e---tiveminanupozu.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/porusamozamav.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/cb1e1e8ff15adf959134af7c9d9f1a46/gagujogufebebokuwitokafon.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/4725030037.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/c0b7d576a8ec3b824908936cbfdfa6d0/20941642850.pdfIn PDF document text
    • http://topp.pl/_topp/file/28673307447.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/6161010575.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/80560799479.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/f797596efc10630e5f16803794591c76/76902815224.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073904e41016---pejidafuxukekedozopir.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/3408770365.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/ruxiliwezi.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/mujipoxuw.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/db95c03ff6aef90a83f100bd5e9b24c6/mebaxejosexijafejeb.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16083430cbfd08---24473955770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=graphs+of+inverse+functions+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_off0000bf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF22 16756 bytes
SHA-256: e3a6cf7afc287765aea16766af5646c3dc454b78109b6554d27e7d6a53bcade0
font_01_sfnt_off0000ea97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA97 10876 bytes
SHA-256: 6ac45eac6a2c43fc73f4175a40952a62a77d8ea3e5c3f6234877b9466e958e9b
font_02_sfnt_off000103bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1