Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f584bc2eaec73a2…

MALICIOUS

PDF

78.7 KB Created: 2021-08-09 07:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d21d65f655f03f9e161cc4b3249b78a9 SHA-1: 7dc01eb3e314ad82cce3bbf5c42f38712eebe13f SHA-256: 3f584bc2eaec73a2c6e3df7a9655edeaf3cff4e2cc30fa8d5eccdfa99775ac2d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, while some are marked benign, contribute to the overall pattern of potentially malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c85e66ba62b---motunexipid.pdf In PDF document text
    • http://synowka.pl/galeria/file/55937324425.pdfIn PDF document text
    • https://conrays.ru/f/data/21221937051.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/tjpcpfbhoghpdv0c31pn5kg5d5/wepusozuwojerit.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/29055882580.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/36530404011.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cfc710002---funimobaf.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/4944024878.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e65f2e7bff7---kumal.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/2d7csikeeif81l943q9n4cb9uc/xazura.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/xiwogaxonitupavufuweram.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/libazetalebid.pdfIn PDF document text
    • http://quaint-house.com/lazemumewuvagu.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/bumujexakagesodipuxi.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c8613eb5a82---mivawijizujijor.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f17481d0866f75ab1cbbe5952c7d5f49/jopebutixalidikitadumiped.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160756eee4fcca---81415135644.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf7ec18339---4155976579.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/bba06d49b8a0e64e0f7eac2c6d0ea237/jonadudobizemoz.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/91b678bef0c79724660c6142cafdae98/58756856206.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/19858950293.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160985eda1905b---6886100039.pdfIn PDF document text
    • http://rotang.net/userfiles/file/mivawiz.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/levevupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+free+cod+points+in+cod+mobile+no+verificationPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/59677447823.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_off0000cd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD17 17032 bytes
SHA-256: 06cf26fd91ae2d49bcd11a147d1a9e9462ac97d51a789fb61c42559617876bd3
font_01_sfnt_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 11244 bytes
SHA-256: b10b5b4d0d7b51d852a9488dd64e6e7b0f8ce60a5503def1616ab8d1a2ab2485
font_02_sfnt_off000113f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1