Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6bcd942ae56046…

MALICIOUS

PDF

85.6 KB Created: 2021-09-03 08:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f1c3c1f84aca3e4fe4b4d436e86f058 SHA-1: 4b7d8ccf2ff4b8a075d705805f29fda440bd0ff8 SHA-256: 2b6bcd942ae5604689ed1133c180c040e3d948a2e4a67c240d1e4ff8e9098d65
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but reinforcing the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/fcjq34vc5klrqicc3el64tdkai/kunibolikelasipunabesutoz.pdf In PDF document text
    • https://isabellepieman.com/userfiles/file/96702881599.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/62764712700.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/crm116ts5tg6nbgmsje83l77m2/2144149186.pdfIn PDF document text
    • http://jpmoto.biz/upload_picture/kenuxizerurewozivaxefa.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/qndi8mlcev517obr9cgr0lpn6p/sopatulusoxu.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/8793329250.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab844f6ba80---44394708609.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7fc0c964f---sutederemaso.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/gugowusezimifanibakidudaj.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/86811160561.pdfIn PDF document text
    • https://noddy.nu/images/file/10487110921.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/newivunapewoku.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/38a3125e102d41af247c396ccadbff2a/38592556797.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/773f5c0790fb30894046b49290158232/62534797885.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/9550121103.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/14446832507.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/91409613320.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/k7bfvakgsci9l4jl2n68s62ed7/nawekebasegep.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/wowosurodi.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/77550978457.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6c17e3f893f9a952bcf01748692c669/suxopuxetefif.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/96346469854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=personal+magnetism+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_off0000e84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10066 10840 bytes
SHA-256: 3a2d5334e13310f85f1d792319a2b6350661675c22343ead09e158f20cd2542c
font_02_sfnt_off0001192d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 18272 bytes
SHA-256: c7145c179e782ad38ac3be9c41eb9213bd6169aec8a4bdfd4df2626a20f3bb7f

Open this report in the interactive analyzer, or submit your own file for analysis.