Malicious PDF — malware analysis report

Static analysis result for SHA-256 4886bf02bc036551…

MALICIOUS

PDF

84.5 KB Created: 2021-07-03 22:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 671a91443b56728b9e52266b737509f8 SHA-1: a71066912df6ef91e6855ca809946c913914bcfb SHA-256: 4886bf02bc03655104bcd7efa1d122e50dc879b6f7147c109e10cde4a151e6e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=directive+and+non+directive+play+therapy PDF link annotation
    • http://forumcutuca.com/ckfinder/userfiles/files/62267379489.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/003e79f8d94f4d8a2c39124cb0c8f1f0/xetibixizemutekujesu.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/9148209551.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed06a021e8---47761700092.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/zarigubip.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/godoresi.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa149ea18b---93742984840.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881a130514c---zebiteneputenokob.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/zufijepozezukib.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a1faf26ca---disuku.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/107abcf786d4c413468df8c178a425c0/zezozemomixow.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085df6fe1a48---74136332079.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c2b65a2e8---wopafa.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/71a05cf71bfdd0ff0327d17517e7769d/34035288016.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/26232444120.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/30492389012.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608256ff063f2---49385191166.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/91901212338.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160c486d0cb64f---namoboji.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/65710748096.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/bexenof.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/tasubatatuzumisake.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc00274887---39619502025.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_off0000ebef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 15824 bytes
SHA-256: 445ad5b09833a490d65b9dded65b2e22de561dd657e207d4212f993e32842609
font_02_sfnt_off00012ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA1 10624 bytes
SHA-256: 42d4804b1b66b2d79d71f4d180a5ddab8ff19799e72aa1ff1178bd51eb395ad9

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