Malicious PDF — malware analysis report

Static analysis result for SHA-256 fccd3488151d6806…

MALICIOUS

PDF

85.1 KB Created: 2021-09-02 05:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bddc26d680edff695c07e774d62de0ab SHA-1: f9731eae9e429afb602c8716b45cec1c6aefa359 SHA-256: fccd3488151d6806f64edc3ba3c0bd6575f955630d98eaa54e855b1c8ba821c6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or SEO manipulation scheme. The document body is heavily obfuscated and unreadable, but the presence of numerous external links indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/2nroq5a4e722ocad5pcrqngcif/83184707741.pdf In PDF document text
    • http://mentaplywood.com/images_upload/files/24693037750.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086f37fd1b2b---95070333432.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/483381f4ac53ed5c11925a1c9eae84c3/58059293190.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959ec3f15db---3239993734.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/favasomagemewudoron.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/fg1nigvee83mgkinedmfal33b5/37426606477.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/japupolet.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/58341823194.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/39850726204.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/6fc4fc78e1870e989892f8dfe4f22de7/livogelemisajevig.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/11303148514.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/gufadubeteseta.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/28a117dbeebb0db198457c3e699449c6/vegatokapafi.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611f840453097---daxujade.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/babelatodekikivasomeregim.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/goxabagiremolelalu.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/nejokarut.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/9f9b52ad433867070cb02eff5c929fbf/fapulebasiwa.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddf02d5670---xologiwiwudonulovuzu.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/15084313591.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202108131557111050.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210815110649.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d32376e0b57---muveji.pdfIn PDF document text
    • https://studiorampinelli.com/file/85911896924.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/vch0vepfd2m1ljiinn00ujejcc/71836053496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=logic+synthesis+in+vhdlPDF 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_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 18464 bytes
SHA-256: 4ed903e0c72cef5aee470598787148e4ed86569da1ea577fd8c5021a1b39de03
font_01_sfnt_off00011628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11628 10524 bytes
SHA-256: a0436fdc60959c8473118e93cd21b98116a285ffce4cabdc93d3b90dac6ebd24
font_02_sfnt_off00012dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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