Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a95308e60a4c5c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 18:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b64174cb5a578b9a9d013d7d3c259fe0 SHA-1: 4c0b2f4c4eb583ed5cadc474ed6937b333b5067a SHA-256: 95a95308e60a4c5c18eca7454dcb4e603cd2d1b5ea7a9728d8b354c12c9f864b
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings suggest potential exploitation or redirection to malicious JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=ncvt+mis+answer+key+2018+pdf PDF link annotation
    • https://ferropula.hr/files/kixinibilerawawasa.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9698a79b4---dadodukisuvobefifapom.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/fj14ut61qk19u5abb9cvb20r25/84390234986.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/kuluzurogalarobeluwilusom.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16073d2c8420e3---fozovix.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/jagixagebezaku.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/xalerej.pdfIn PDF document text
    • http://christopherdallo.com/file/geremiwepononir.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160801a6dbd866---safuxanowedigukoxaxo.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/343a766f56243efb5cdbc1810fd3c7cb/bepotagisuvemubomibi.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797a2bdad6f---jesupirabem.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3acf0fb53---silejovivagu.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/76103869635.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/julunepuwixogov.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0c8bc1566e034503fedef1fe63a7955e/nomulunifamujesukigizu.pdfIn PDF document text
    • https://efnnma.org/files/file/puxapojobaxupazizepemuki.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/vevuje.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/polefuwusevewefalop.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3bf5c58dd---91064571489.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/kmeucd4rlmc3eec8vqlsl5gog4/zanesavifabilab.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e93b5bb67---tosederodupaboxurolowuxa.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/mijodixegeja.pdfIn PDF document text
    • http://janyska.home.pl/_mjanyska2013/fotki/file/44547445050.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/cecb63bdeb9f737c7af01498a1322941/38829428647.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_off0000d4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F7 11452 bytes
SHA-256: fe920eca942cac1df42801768fffb280881af1c6d00c3477f846d3b85a834d2b
font_01_sfnt_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 19760 bytes
SHA-256: 748473b6913ca1d9eb32c0047df770ee631c0c6dbb72df6d32ebe27fc1eadcd7

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