Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed0bc67e940361e…

MALICIOUS

PDF

90.0 KB Created: 2021-09-02 19:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 49b8c17842cc3fed41fd118740956cac SHA-1: a084781781ce2c3838b5b0887e4438c2f37b1b87 SHA-256: 5ed0bc67e940361ecdc38eba37b7ebf900983826b900e8a2ea341f6d7b109cef
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories on various domains. Heuristics indicate this is a link farm designed to obscure the true destination, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4990eb3bc---wojoregukobetixo.pdf In PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2ce134f5cfa680c8d1adcf483f8af424/salejudezatobuxagoj.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7e25d5734---43806264692.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/jerevisefixizifokuze.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/18902903307.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/lekumin.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210811131424.pdfIn PDF document text
    • http://fotossc.pl/_files/file/suvez.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b1aa4584f---wewogemoxodelesasofavu.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/e43fe7a25216d500b7f905d2de373220/6671407667.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021619043155898.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/gowemodimupisatitunolep.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/54054677846.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/xipumuzunibofuxetaba.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/luwelug.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a530e101fe2---zepulazulezoru.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff05a8b8300---31088002826.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/bdb935cea2d84310072fd23da10aaae8/3366786761.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/pobuxuwijefelego.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/ginovatame.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ea2922e02---53855245092.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/d8c7v6jlr3sr8vrqs123m62a2n/kibojufi.pdfIn PDF document text
    • http://a-xian-coat.com/uploads//files/202108030850512487.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210605032252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=designing+for+safety+in+construction+manual+pdfPDF 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_off0000f88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 18044 bytes
SHA-256: adb46aa3ebe2eac607a338a7de2e818b807d4ea289823818c4090757a4f74c0c
font_01_sfnt_off000127cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE2 11180 bytes
SHA-256: 2473536851354bc311bc1262c6e7b628b935b6fb0ca4faa5cbe62217a882c6ce