Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ead81c61a32a32…

MALICIOUS

PDF

87.3 KB Created: 2021-07-25 00:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 05e56cbb9f78619a74aed758caf75fc4 SHA-1: 61d0f3569f2a483eba8175ba066e6492814a3794 SHA-256: 50ead81c61a32a3228a01837c03c469764261023130bbe64ef80337c308e536b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://kalmi.ru/upfiles/files/solatisutefufozibo.pdf In PDF document text
    • http://savalis.ru/userfiles/file/xuxiwekulekogelube.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kujajuj.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/gawagopakujarokonowemokul.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/vovuf.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098c149a7ae0---26279736318.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/lilop.pdfIn PDF document text
    • https://edusfera.pl/upload/file/vibidina.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/b092554d1108a73c708bfcd45dfc5678/jasuzetowaruvovemoteris.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba6190db4---91345976414.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ajafibian7r8qk6hafgqjfnsj3/pokivuvidetu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888636b3348---juwuvuvagerajojef.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/wokobekikomatunekozas.pdfIn PDF document text
    • http://korytnica.net/data/files/gevorozijufagalolajafajiv.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/i7r0q0s3gnjckepgdb43qhd8ff/talagubivuba.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/2reis0g0br39797oftfq8i7cfs/90736164725.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/vnrk9k2g92s5f5o96el573n2b5/parulegarumivenubexofal.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/71becec4640a1be7870bc90c7e19bd7f/savanezona.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ikcrr0c90oncpkchhu02om7ckd/53057424665.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b79da33f9---wuvenifavopilanadulevuno.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160700b5e4468f---21984328628.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d20a6f327---20567492051.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/npccmnoqbuq3c8akjosqqpn427/nulixupobuzokamel.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7b1e15e43b6e4d7d6da6fca5737fe021/15194195543.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/luruzaxozipiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+is+the+easiest+song+to+play+on+the+piano+for+beginnersPDF 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_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 17676 bytes
SHA-256: 8fbe2a140539fcd8d413575f3bb19acebb6849961225819b6df4d63257eca7b7
font_01_sfnt_off00011c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3B 10884 bytes
SHA-256: 9b6c271a655393066c69c8cb8a88e147306e2ba7b14f97012715b43d788febe4
font_02_sfnt_off00013528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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