Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd2730bca0f4516…

MALICIOUS

PDF

86.9 KB Created: 2021-08-11 13:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 943d5dc1ca14f9f21c8962d49c0e4e6c SHA-1: ce80d645d57eb46baecab9d26b025b93b97d2455 SHA-256: 6bd2730bca0f45162e6aea960e55ee301a8ac250cb1e5c81228f0ded8a7ab5fa
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution, with the 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggesting a common tactic to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://hotelexpert.ro/uploads/files/19405376532.pdf In PDF document text
    • http://yuemeism.com/uploadfiles/files/witamurinaxanekel.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/c6ftsdbcgqrfg2jok4o24b4bm4/xewev.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/devibomanut.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/25d326f3f0a120d57e71a1349f5599eb/zenas.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/wamumovewamofupuwurefuli.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16213026630857.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/87504680654.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887f34783b3---gapigidek.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1610e760072aa0---gudusixekur.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/32282359239.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41a5f5cc7c---gowufopud.pdfIn PDF document text
    • https://visualarchive.bg/files/gisatozobote.pdfIn PDF document text
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/barinadurekodugasimitibup.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a606c9720---buzoroxi.pdfIn PDF document text
    • http://kotolantopeni.cz/file/48860805967.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/72f3bacae94f500f1d6e48d12a7e1b45/kizodez.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/gemafejuvebalutuvokobadew.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160f4b2d8f0601---varefutakakevutokogi.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/bejemaxu.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/2lt6smvicnappchko50gr2q1ko/14274056980.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/sizekeguvavarotunis.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210720013710_ue3bij.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/5a678d34d812eb5e9e34eea5a6663e76/62330661538.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/1395554566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=digimon+world+re+digitize+decode+3ds+english+romPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE29 10972 bytes
SHA-256: 4691af254d142e376aee7fb06271c9741266744c22626704c3119d78aede55e3
font_01_sfnt_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F66 18632 bytes
SHA-256: 2d883a6d9c860b0a6b5f960149983ca875b535cd09e120c038c50d1d1b8ea827
font_03_sfnt_off0001400f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400F 2824 bytes
SHA-256: 6c917b8f2009cfc9d2d45e46e71d3c81d2e29dfa434546e6c648de70733ce123

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