Malicious PDF — malware analysis report

Static analysis result for SHA-256 718f5a8d86b0f44b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-03 21:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2754460a3b77fa7b1dbd5dfa5de291b2 SHA-1: 203af407867f3a0c980808310af95987889aac6a SHA-256: 718f5a8d86b0f44b0771fceb55406f3a07f286b08907a9814f40c2127fe684e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://irlanc.ru/uplcv?utm_term=schwinn+430+elliptical+trainer+user+manual PDF link annotation
    • http://klpa.net/userData/board/file/finaribimapiludosen.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/56117844082.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/wilawagefiponar.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/32358234322.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/novawogowofawa.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/53670959135.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/fodugata.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3334b3e3c6---26738357076.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/94734541675.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/66231480492.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc4b0ef2db---putewageburodukejuk.pdfIn PDF document text
    • https://codecs.ro/images/file/8569825652.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/35847031901.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de939967e7e---sixijaponowe.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/15012209893.pdfIn PDF document text
    • http://artospace.com/pics/file/rixubap.pdfIn PDF document text
    • https://khanikango.in/file/vedibexexisopiwesijaz.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ke26j0h04740s67q3hhnclkn7q/luwulig.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/xitadunutotiko.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/bisuxas.pdfIn PDF document text
    • http://apcmagon.com/userfiles/rasabavi.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/19486e7ff2b86576a434f14f03f0c4c1/zetapilavugonutilevavene.pdfIn PDF document text
    • http://korytnica.net/data/files/jelajobavegasip.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/85507151643.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/742df7cad4571f210399b8c7e53260fe/joparitizavevuk.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_off0000e29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB1 17396 bytes
SHA-256: ebd268f84c716f419eb8440425cf33e988bc63dec4e2bfbfc19f02889bfd5c22
font_02_sfnt_off000127bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BD 11152 bytes
SHA-256: aa87b1cec9d78fc35a2d7d76000d971f23a7370512b92a6d28652354f29dcc20

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