Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23f8f1df22d542a…

MALICIOUS

PDF

89.3 KB Created: 2021-08-09 06:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7a79928932a75c4aa1aaaf63a7eca08 SHA-1: 7a44985283098e18924f4624e77e392f3747e7c7 SHA-256: d23f8f1df22d542a21cc6ae3eb8e4dca897a217f409a737ced140085963f31bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, indicating a likely phishing or malware distribution scheme. The presence of link farms on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baafbb67bbb---jaziwa.pdf In PDF document text
    • https://luminex.pl/upload/file/64555802936.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e0fae7a27---mowemivumizerewuguribus.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/66674083983.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/zuwiwedutapumizafuw.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/e2141e496942e64ef3d64aa4308f40a1/zixuduwufuseba.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ea9fcec6d331fb996edba5d52f6ba1cf/manage.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/26402262532.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608507ce45896---xasunisefoweg.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/15917925989.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bc7cd1c07---gepotuluxopopovuzojojeb.pdfIn PDF document text
    • https://arerp.kr/data/file///8218498368.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/1c6a023a20ec164e06f03e04a156b954/wetabekozagun.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/muxamu.pdfIn PDF document text
    • http://bakoca.hu/files/file/98555481991.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210728053830.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/14330789481.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/wupokitegalavadakurazuf.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/lq9dok8vmaceg105f9jcbja4q5/jalenexi.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/67219d52bb9ac19c69900fbd2f25ad78/91340928785.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607459e82cac2---nepakofawo.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7f9524950---bofutirifele.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021080223562281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+are+your+strengths+and+weaknesses+for+interviewPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854cd8c3181---kesibirisijum.pdfIn PDF document text
    • 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_off0000f8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001110b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110B 16716 bytes
SHA-256: 6729dff55c1077b911a985c443b1850d2ee00832dedb3ff64ae9b950a26aaf52
font_02_sfnt_off00013c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4A 11040 bytes
SHA-256: 9d9e3fe13e821885b5751594e54a7c98a6c75a314ec3f8dcf320f8a7b271f1cf