Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2fa4e58b4ab57d…

MALICIOUS

PDF

75.0 KB Created: 2021-09-19 22:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b18536222110469ac3ba661c68745188 SHA-1: c3355be7cb0d3e71ac37ee0c99e2a09e95dcfee3 SHA-256: 7c2fa4e58b4ab57d96e7ff496cd118c3d5cfe1c4900345145c45802a73b1f2bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and multiple heuristic firings related to link farms on compromised WordPress sites indicate malicious intent. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure to download further malware or redirect to phishing content. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b32282ebb5f856ad42aeeecc5774d810/36179045485.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/sjdfecn5rl94tu823d0vn7vv40/60497927069.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/13573251083.pdfIn PDF document text
    • http://boldogelet.hu/media/wudev.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/10119146298.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/61410978963.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/diteziwize.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/jebivetoxufamonaveto.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/89249182503.pdfIn PDF document text
    • https://shibbirs.com/media/files/fosakuwofuwet.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/mipapudogunibim.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/21769259795.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/mutegixoporolubo.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/71421131211.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/74352ab25b2401230fa76fba0b51376a/74479355504.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/46216533234.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/wakisibilezije.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/gokotelaf.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/73ea3d2aafc471afec24f15843114314/soxejegatuga.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/65478497598.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/87636409968.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/50853344845.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/80500032737.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/moboz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=windows+mobile+x+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_off0000bff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF3 10632 bytes
SHA-256: 940ff7ae49d63c853ad50ba18b304846ab5abee449cca873747363ec286da449
font_01_sfnt_off0000d844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD844 18204 bytes
SHA-256: 2aa14e73ac9f2f025d61f2116c79f5f9095d5f30bf3f5ac28d27ede004182cdb
font_02_sfnt_off0001063d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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