Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7be02987e28a650…

MALICIOUS

PDF

77.2 KB Created: 2021-09-19 03:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33cf77b5ddf55ad930ccc0ca931e8322 SHA-1: 49a8131ff07ea0fd0085236354bd926352c2de47 SHA-256: a7be02987e28a6500e60cc44aac3ccefb207d83b6941aed340e9182a92514f09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised websites, suggesting an attempt to lure users into downloading further malicious content or engaging in phishing. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://sbcnepal.com/images/file/sexitepa.pdf In PDF document text
    • http://henanshuangxin.com/d/files/49681775326.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/78436958809.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/71002742977.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143750ec0729---78337279803.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1c79143a25462ddda083630458037cf8/54509749614.pdfIn PDF document text
    • https://nasikampung.info/contents/files/98226566471.pdfIn PDF document text
    • http://tyextractor.com/d/files/71679056563.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/56617274258.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/kebaxujijisiziwexeza.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tozofinif.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/bc05eelc0s3r5pp5a00shptu20/22705763225.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/12428286060.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/64060001612.pdfIn PDF document text
    • http://iucecb.com/files/file/dupunel.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/36453640076.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/17469486531.pdfIn PDF document text
    • http://protok.pro/upload/files/61990257053.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/13462741279.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mitavafitirekidu.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/4c0d2376e19344c5e4dc4c3fc097a7ef/28663825226.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/bixeninonozuzo.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/kuvezomitekevopewogo.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/75157706450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=radians+to+gradiansPDF 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_off0000c8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A1 10292 bytes
SHA-256: 99f1fdb647010e03888bc244713d6fcf387177de3a38f8dab51da0ff6938f34b
font_01_sfnt_off0000dfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 18348 bytes
SHA-256: c67bf56ceb5606b94e213218b88c51a00ca3b353fd593aeb8c3ecce7e26bdaa9