Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab19670d7dc94b5…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 09:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c82b5322f7bec6ef259b104d90dc94cd SHA-1: 85e3379ffe4c16b9713f7f0b3de9c2bde1834d59 SHA-256: aab19670d7dc94b59296004790d11f6d80528f8310c94c9569c313353c741bd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=this+is+us+season+1+online+free PDF link annotation
    • http://ccadl.com/files/20210919182550.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/gedigoja.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16132d113df5a8---41201105490.pdfIn PDF document text
    • http://ceroki.com/image/files/65765618845.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/55626119302.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/39151308187.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/pepovibuzesusiweradif.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd6d552336---rupikesanimulamatibadexu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16140da7a34869---tijepupazuduzegasemakemi.pdfIn PDF document text
    • https://everestart.com/images/stories/file/52945961505.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/gumonedam.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/56286350649.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/mofomoxibiwififekimolo.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/12103878823.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/kufetewapivitenakuwe.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/97674160358.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/feluvuduxulobaruvej.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/d4ac6832e0a853869d4bf6a153caf941/ragakola.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/73602506923.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/fidajoleba.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/jifuwitonovejaze.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/rameza.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_off0000dd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 17948 bytes
SHA-256: 34739d8277c3f14ed2e315eda235bedf741f2e260e127ad667a2a7c747e2167f
font_02_sfnt_off000123be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BE 10328 bytes
SHA-256: 1259448e604167584977f2a812a6463dd675228bb7ca9da5fc18f208f4648adc