Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ecf443e5f78fd8f…

MALICIOUS

PDF

87.7 KB Created: 2021-09-06 06:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b336bce9a7bf0f7ea62825f1ebb7074 SHA-1: 59d7a490b4096d8b19d5fec7ee1cc138ee6173bc SHA-256: 6ecf443e5f78fd8f790f3bcab3b38d1d66b804121d9baafb2239a83ac3729e7b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics identified the PDF as a link farm hosted on compromised WordPress sites, with numerous URLs pointing to potentially malicious content. The presence of these links suggests the document's purpose is to redirect users to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a30251033b---47963274636.pdf In PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/d55o2krmr50urgchhgvlij1883/58859092045.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/melakinanakareviwojedopat.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/29c49649f85f38578dd81df639fb0644/fumesop.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/minatufinenisiseb.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/beguzelig.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/12126802223.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/3aclk5k6q74081e54j37mv7923/65512919449.pdfIn PDF document text
    • https://aaaxxion.info/images/file/rumixolamevusevem.pdfIn PDF document text
    • https://kaparatt.com/images/File/tovunidasebozaliz.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863e5a49354---fubopunez.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/1003560855.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/38431855577.pdfIn PDF document text
    • http://erex.hu/upload/file/3346941239.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/josalef.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/50415539920.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16082e9f0a96ce---67115291047.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/86115433751.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4003f76ff4---70356676836.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/de409622f1d231be9e6bca1c5e7166bb/kodusav.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/dogeririmodoluv.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/67729067948.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/zitunilemoxolufu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b52f9db52b---38664129394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ganglio+ciliar+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_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 10436 bytes
SHA-256: 1357e27ae90e03db7ba7ee315fefbc76d418cb03b9a69d46f34bea8dba600d99
font_01_sfnt_off000106fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FE 19000 bytes
SHA-256: f9f09108f76cdcbffad836959c87fce923b67a1c8acca881bb544a7a1426c5e9
font_02_sfnt_off0001380a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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