Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15623ef1f899f05…

MALICIOUS

PDF

72.2 KB Created: 2021-07-14 02:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ccb70128c3342feffcfcb32a21dd801e SHA-1: cb2e8d595d575eaa03da040d0eae4ab95ae594ce SHA-256: a15623ef1f899f0553bcff0d86696fee59450ddd444f900131d244b25551fb30
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The embedded URLs likely serve as lures to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crysiq.ru/uplcv?utm_term=the+meaning+of+spark PDF link annotation
    • https://nepalaviationmuseum.com/userfiles/files/55627250371.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb3df509cf---togixalovuwoki.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca852f01fd---guwobowewuk.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/e6b02fbc101731990e264755948a6687/96745315563.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/kunoz.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ecde89197e2---5541674443.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/60174547956.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/kapogogenomosuw.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/kafidofep.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/34041577603.pdfIn PDF document text
    • http://www.toptehnik.si/images/mosepeterewe.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/bibopijapole.pdfPDF link annotation
    • https://hondamienbac.vn/userfiles/file/4446776787.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/b14ce608aa46fc913d0701fe53ce7e29/36665116469.pdfIn PDF document text
    • http://hevolta.com/upload/file/bisolavunaf.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/db025623f831f8372210d640d301473f/tibiwojepipefudiledew.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/43444235169.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaae493a70---nogilikutumudibilujolefu.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/550f9576cf64d347ada1133cd69852f2/nubokupewemokerugi.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0f0cd4dbf40877e8f74429fcfb61712b/43253638377.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160883c20f325d---tifike.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/20496055255.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/79887821226.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/vavevijegarunige.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_off0000bb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0D 15700 bytes
SHA-256: 4bf2107fd318b21dd96f8569485becdc40f72575c2077c04d424e2e9e67dbed6
font_01_sfnt_off0000e36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36F 10716 bytes
SHA-256: 123f69d6be932a37443660472ec48bd3b04074157192d0dec482d14d21899bd1
font_02_sfnt_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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