Malicious PDF — malware analysis report

Static analysis result for SHA-256 546fa0918a2b61d6…

MALICIOUS

PDF

75.7 KB Created: 2021-09-11 00:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 08e3855d3e5e7ade3b81f7b5d6c4f3cc SHA-1: 5ea5a55682f5ad028c2ec01c280f78a15f2e621a SHA-256: 546fa0918a2b61d6aea3772cdf4b9af68bd3bf6720cbeafaa005cf7bd5c67419
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. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised CMS upload directories. The PDF document body is heavily obfuscated and unreadable, suggesting it is designed to obscure its true purpose, which is likely to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://sendedianqi.com/upload_fck/file/2021-9-7/20210907012724165497.pdf In PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://seksdagen.nl/userfiles/file/10383568899.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/27181375359.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/14228597101.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/7083264003737d825d793f16a1f6313b/4421210763.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/nupodefoxu.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/84562192070.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/6265563466.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/gedelobosejaxisapej.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/72033084004.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/pofisegetipivazoxutisa.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/koninexezapibatapomu.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/sazonesixofasolaxigojipit.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1612f795cc2215---78771743088.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/lenaji.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/43473196739.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/malotubitotagebutanatam.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/31946782932.pdfIn PDF document text
    • https://ijp2.com/contents/files/56755224952.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/30ef4e73ba71a03491ef1e28fa08f013/45623201512.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132bbeebf994---rirubegowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=gloud+games+free+to+play+200+aaa+games+mod+apkPDF 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_off0000c4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F3 16312 bytes
SHA-256: cac547a635d4adc21b336e911a06b0e46747be137dd1c88820666ffab1be6907
font_01_sfnt_off0000eeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 11232 bytes
SHA-256: f3942efb3e372071dacc44dd7068bfd7d655ed9cbf047ee55a669999215eeb4e
font_02_sfnt_off0001093b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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