Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c9407a5ecd6937…

MALICIOUS

PDF

80.5 KB Created: 2021-08-19 08:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 323134a9b485c11e032f5b9e50c4f14a SHA-1: a2996ac09a6c218c8c9cd1542b0db2900b4c0b02 SHA-256: a0c9407a5ecd6937d7a775b484ae13456c9dd8d4b1074642221ab792cddeae20
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URI links and link farm patterns indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=how+to+show+assets+on+a+balance+sheet PDF link annotation
    • http://seksdagen.nl/userfiles/file/xewenemilujokirufumunan.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16088750414d27---62946514875.pdfIn PDF document text
    • http://chipgene.com/image/files/20210809_103429.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/nafaduger.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/5ab4c6250370679321b083419a422e67/93908640860.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607407ecd0a7b---26910001947.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/58335289910.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/37726067683.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16112e019e30ca---1825691987.pdfIn PDF document text
    • http://polletnv.be/uploads/files/34555991157.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/59125707316.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/nimila.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2c2cc057e---35994180626.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f91e517edd---rarijaxarezeporiroziluxo.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/63579142175.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/fijonat.pdfIn PDF document text
    • http://stattus.com/assets/file/kotoxosaxonu.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/vifekiluvoxukabuxubug.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dee7b3d8627---29617750972.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/vunafijitofa.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/90817597189.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/folenezur.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/fenarewazivabojapikukat.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f008f0e91f---86354871746.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_off0000dab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB7 16088 bytes
SHA-256: a77225f751884bcd11e20e5589c9694d33d196efe36d6ab2ad83ca21db8dcb0b
font_01_sfnt_off0001045a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045A 10352 bytes
SHA-256: 505256322fa4d6e38b665ce29ae8915c7bdaee287c2e97e57ab95308947dfd51
font_02_sfnt_off00011bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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