Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e0c2dfea4739e51…

MALICIOUS

PDF

84.1 KB Created: 2021-09-15 19:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 106f56b460d8a6954cca9577085376f8 SHA-1: 0e4e23b318ed1764c5d75d1a37d8129a28b2f13e SHA-256: 2e0c2dfea4739e51828e78a4d709c903a7be939e46fa6cdf259040de75e929b6
232 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external PDFs hosted on compromised websites, indicating an attempt to redirect the user to malicious content. The presence of heuristics related to password-protected archives and callback lures suggests a phishing or social engineering attack designed to trick the user into downloading and opening a payload. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c93a0ba8d---240573323.pdf In PDF document text
    • http://vkts.se/userfiles/file/15142378443.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/jupufewavibuzasatebe.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/24565799215.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/rebowewenosometixalinila.pdfIn PDF document text
    • https://kristinanamaste.eu/files/34041764650.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/71743187466.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140c011caeb6---vojovebexa.pdfIn PDF document text
    • https://dyaa.club/uploads/file/jonetupeza.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/pipuzurajodugifo.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/10315287038.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3gj9fuja3r44jvrlo1jv5gvrr5/minonupakusutetaker.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/regapavefujejupelu.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/12345113020.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/70047557600.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210902_231109.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/zofakavebijosozobikikaga.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210908163113591172.pdfIn PDF document text
    • http://prompol.com/media/file/sebazufiwadorelego.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/18765451205.pdfIn PDF document text
    • http://krupongs.com/images/file/kosavereruva.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/sefes.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/24115143747.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b640676a10---67782648521.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/16762673241.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/o5b76q9b0s85smdqe7o2v9ule7/17712882218.pdfIn PDF document text
    • http://harlit.com/upfiles/file/18347702688In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=a33+tablet+firmwarePDF link annotation
    • 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_off0000e434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE434 17924 bytes
SHA-256: 4b103c2cde76249facd4d4b75eb55727d1bcc2aec901414e8564be0b939b8289
font_01_sfnt_off00011322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11322 10364 bytes
SHA-256: 5b7a1678f761148a10e3dd372a201721b4abd68d40838ac77460406d946a5138
font_02_sfnt_off00012aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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