Malicious PDF — malware analysis report

Static analysis result for SHA-256 b286fff1f13a6653…

MALICIOUS

PDF

90.6 KB Created: 2021-07-03 02:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53b08df34d72ac960f72e472ad2be77e SHA-1: 49143c37c79892fa480ea8d4ecaa898341604357 SHA-256: b286fff1f13a66532a85496e8715e1d563c710d3459347d729c9afe83922bf48
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of distributing malicious links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=ketu+in+first+house+and+rahu+in+7th+house
    • http://akinmedikal.com/uploads/file/20657389242.pdf
    • https://heritagecambodiatravel.com/userfiles/file/52949796110.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07cf8dee13---99958452781.pdf
    • http://dharmapremipariwar.org/userfiles/file/wavibuj.pdf
    • http://accessiblevehicleservices.com/userfiles/file/16459797691.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/daafb6d6bc243420c4523b64a2a7ba14/legasexorizos.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/b83f916cc8a17769af821664d8c8b673/zutusuwibadava.pdf
    • http://mexvp.com/ckfinder/userfiles/files/fibokuwukesevowu.pdf
    • http://fixafilm.se/userfiles/file/worolefesedekiwaresise.pdf
    • http://tuzvedo.hu/elemek/file/52779788160.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/7064848c381f9a717c9c4ea03e80bfa5/77538081021.pdf
    • https://stvorki.ru/files/file/vitagufamujujitata.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a8d5c4400---99570623074.pdf
    • https://arvikabc.com/images/uploadedimages/file/kebedugatikob.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1abf1930e---79373216152.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708b9bbb629---37587593474.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/qhjce0phduqj78sfaphphb4s92/wazezifelip.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160be3ace46119---47869775628.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a9ba43cfd---vugetegoxeso.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/81352599743.pdf
    • http://cichanski.com/Upload/file/28847823264.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5de7aea8a---maveruzejapofegizofe.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/46dd8f7bd75cb7ef4f8a0c276dd06e84/rikusalixukawo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010267.bin
f6ab806894e0f6fbaab7fa44a3543667c331082296ed37c76e2438af903d134b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10267 16296 bytes
font_01_sfnt_off00012c99.bin
ee076434d4b39a6c73e1b14bd8f3e591be38dfeb391a07ba572c923242df268f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C99 10548 bytes
font_02_sfnt_off000144a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x144A2 16792 bytes