Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c817097eda840e…

MALICIOUS

PDF

75.3 KB Created: 2021-06-30 08:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: afef43cea5f509f8e698d77ca42eba83 SHA-1: 2eb2ddbb0eca744119a75fdebee72812e816edae SHA-256: 66c817097eda840eb3cbc6bd24468b26dea92673a4307e2109f7053f000f3606
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, indicated by the presence of a download button and a large number of embedded links, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=precalculus+enhanced+with+graphing+utilities+7th+edition+answers PDF link annotation
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/6bd05a61c23030f1538019025a658053/nawimofirigisidixeniguj.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/8358a7cef1f44e59c54d49609d09a396/duvesugudexopigor.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/101517c9d75e2f4730028edb1e971c0b/suvupoxanasorel.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b77f387ad7d---lalegurafozo.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/temagipuvodexejide.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607516219ccfb---dapurepikitunun.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/nfmfpbgfohhh5lsn8lac8erbc9/dodevikixebu.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/06be8fd86973f5c5a3f143e33d7c4bbb/tosomefe.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e45361a38c---xupikajofemuga.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a3df7599f67f239393dfa427d5bdb8d3/xubananine.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609472be1fd93---81793741407.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/visuwupajipur.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a544c084f67---wegixonuxetewu.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f8c9ddb1a---57754513202.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/68434065823.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b6f9150b8f0e70ba71abef34fefc2d45/winozuvutijimex.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d140ba0d8eeff48d6669b69b0a46e443/94020833375.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/45872065990.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/1434935406.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/qbhrjh4s1p89i7eah62s8um1u2/58315105223.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c2k1kms500lbkl7pdro4al7nk/56784708222.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d8c554099---wojuxawuduwobegera.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/rosusevifozararoziwag.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085e3dcc1f5d---wevoviverawiw.pdfIn PDF document text
    • 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_off0000c1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CF 11032 bytes
SHA-256: 4ca01bc294638850f08ac498d18fe4a6ea7bb6946f6aabd7de9deec93a813714
font_01_sfnt_off0000db46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB46 16936 bytes
SHA-256: 089f98adbebe733b1f99aeb99e9d9517215463f4de20217dcf1b6174b7c37f2b
font_02_sfnt_off00010704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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