Malicious PDF — malware analysis report

Static analysis result for SHA-256 562382f89e3111d0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 23:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 35437d926eda943383241e5690dd6a50 SHA-1: 3497f1dde5e318a4484456aba150f36c60e276fd SHA-256: 562382f89e3111d085cad2b99973b5b771be76dd9724724db7d45a716dab86fb
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://baobianhkhang.com/upload/files/pafuvuja.pdf In PDF document text
    • http://shiokuda1.com/contents/files/10828474331.pdfIn PDF document text
    • http://klemanpince.hu/files/file/4774855397.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/bojivusuzux.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/xizifu.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/11258925620.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/4560886266.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614031c61daad---mujopopezadujekovosuserur.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/8723925547.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/gitose.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/67077113681.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140c9e2a93fe---magadojujelaj.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/27368613350.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/gomaluji.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/zegonaxilame.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/62414084069.pdfIn PDF document text
    • http://clickvay.com/upload/files/97861749312.pdfIn PDF document text
    • http://btfa.tw/upload/files/48663528895.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/tesotuzesijenonizapiwite.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a79676631---64051973516.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/kodurivogetibarusonivako.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/niwepove.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/seromel.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/betarixugirawuzawededet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=fake+gps+pokemon+go+androidPDF 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_off0000de81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE81 18540 bytes
SHA-256: 03dc046c35657f9c4f1fe7145dc4766602a784b5e8eccf33f147ef1fe8eca8d6
font_01_sfnt_off00010e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E83 10660 bytes
SHA-256: 1908f1f804b7648d89d0074a25c838d7c367d7c0d55e3a8f18f0967552dc4270
font_02_sfnt_off000126a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1