Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d8e8b941473ab6…

MALICIOUS

PDF

87.0 KB Created: 2021-08-01 03:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 30b88d13572e5ad06e608bda661bbf80 SHA-1: 099a457557448fb8134215574389352d242aec3a SHA-256: b4d8e8b941473ab6d9111aa2a0b1ad5453e2d79b8ecc6390720328f72f12c9bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://rheinmotel.com/userfiles/file/pemututoverowuxewaruda.pdf In PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/26121514967.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/67384734827.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c941e29ed1---88775396834.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/gimadila.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/1ff9c051c36fe535f5e818bba07c1656/fukezo.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609747ef64d39---torutakineju.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/sedilugojorilifikitesogob.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/sufolujuzapogebodovavojew.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/73914003137.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/dumigudufuboxagaxevus.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/ukfmdr31h2i4hokr19r2a8edo7/70056750874.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c470c118d2e---kipiwesawatudageruvudinuk.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdb13dc4f0---78261239564.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/651045487e3254e7d8b3f43c2235d85e/lowiwaralelijigafore.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/jesadux.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc8c9d754d---kaxag.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3de507a59---12823889643.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/36de02039083566de468233f79404805/jodidifivafenuwalalixut.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/62655038227.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/22495502740.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/40010548613.pdfIn PDF document text
    • http://artospace.com/pics/file/89635110812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=iron+man+games+apkpurePDF 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_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 17256 bytes
SHA-256: 99f6b10e863217a6779a611930012f18b73113af919607634a55d331252f9fa4
font_01_sfnt_off00011fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BE 10504 bytes
SHA-256: c30197b0497be6dc26688ff4732d94480d7b639413174ca2b9ae2a481f1c0d07

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