Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc49dc84a29867fa…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 10:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 55d4fe62dc787d3c5bc47296f5d5ad98 SHA-1: 2c2ea53d843b6845bd03cfb58704deef199140d4 SHA-256: bc49dc84a29867faf13de803ad326c94c5e6b1e9d4df7a7a927890747c737115
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The numerous external links, many pointing to compromised CMS upload directories or disposable hosting, strongly suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature.

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.
  • 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.
  • 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.urbanwaterways.info/files/12096249903.pdf In PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/43bscjnpe1grv7vcn1di5dqcme/pubitibedusovo.pdfIn PDF document text
    • http://htwy.com/upload/file/tisepirobuwadinijifawera.pdfIn PDF document text
    • https://ms2oke.com/contents/files/68880665541.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/73224017555.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/087daf4772e83244caa0a4b58fce904f/70414296128.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5a2af8eff7226ba485737c0c4a6d9d51/juwomixesutabakepijav.pdfIn PDF document text
    • http://ledins.lv/cms/file/77709275080.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/vibojikewofikagewu.pdfIn PDF document text
    • https://norservis.cz/files/files/kegatu.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/lorokijadafovatoxijetol.pdfIn PDF document text
    • http://akademibt.com/resimler/files/xunosexasufivuvunoji.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/vutexeduwusewefevep.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/relekowusogalubi.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/3797606644.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161410e6e8ffcd---87510508156.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/davuvibimugisuj.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/gogojivatoxomow.pdfIn PDF document text
    • http://glassick.com/userfiles/file/lulapapefoxu.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/89956425662.pdfIn PDF document text
    • https://costarica4d.com/contents/files/77743091475.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/sukijegedibaxu.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/mupobaruribajavakebub.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/zezefixatozeg.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/66706778870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=camscanner+app+old+versionPDF 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_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 10676 bytes
SHA-256: a9fc12e4d3e814f0efc21fe42c5ce586de89583e151da886de12e0857ed0bcb4
font_01_sfnt_off0000f790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF790 18012 bytes
SHA-256: 788a0671a098b7b2306c3d46aaf5650eb8a7a75174f06462b2353ba99ea5b04f
font_02_sfnt_off00012617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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