Malicious PDF — malware analysis report

Static analysis result for SHA-256 88201c36c9ebde65…

MALICIOUS

PDF

90.3 KB Created: 2021-07-20 10:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66b91652e04c8974229e675303089213 SHA-1: 2045b77c2b2aeeafd3a728d8a4c12da134613e8f SHA-256: 88201c36c9ebde6530ee8afe03313504612e038d8ef999b7a735058b38743b21
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://micast.de/wp-content/plugins/super-forms/uploads/php/files/0erl5issqf5oba486snju2o9cb/63290523602.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/8b678848f5650acfabc2fc9e01c0b7d6/86479623089.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2073d9e746---48934796313.pdf
    • https://autotrans911.com/thread/admin/uploads/file/24486451075.pdf
    • http://beijingxinzhi.com/userfiles/file/20210518001655_1108499576.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d02cf2a21b---fofetadi.pdf
    • http://agnieszkapawlik.com/userfiles/file/suzumonigegoban.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/ca683c19f95462da2732a48b0cba7e4a/45281843126.pdf
    • https://tyko.pl/userfiles/file/digejiselifibepugofojojo.pdf
    • http://piri-piri.pl/ckfinder/userfiles/files/jitujefadenamaxalebepab.pdf
    • http://askort.pl/Upload/file/guvopigokavisesivogimig.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/ad9f18c2aa8012bb5ab7cd1dd28d46c7/vavikiratazu.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/573de702e2a774f88f031d52a0d32514/71017874875.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2604b3eac63dc651240a59c8a3608354/79004066303.pdf
    • https://annjulieskarpmo.com/userfiles/file/gokedekefakewoj.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a26d1416f08f46c205694dbfec0c8932/8835640820.pdf
    • http://gpszone.hu/upload/userfiles/file/bawigalidago.pdf
    • http://thuephotocopytaihanoi.com/upload/files/35967295091.pdf
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/rarawiledepejode.pdf
    • http://alfavit.tv/userfiles/file/tijosasulomo.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/nj8cc7vg4sf41s7hl21sl6n704/tulikane.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/5f5a5aaded195733f300ccf78e923dfb/33311541400.pdf
    • http://ajivikafinance.com/userfiles/file/rosibofoneveb.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=that%27s+too+bad
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101c6.bin
8d90e2696b22acd931e5918360231a8e927930053dbc0ea813fb029f18f5f524
pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 10008 bytes
font_01_sfnt_off0001182a.bin
41434292944d82666ee939328642c3a344b5b850a52b3f235dae29c937466df9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1182A 16936 bytes
font_02_sfnt_off00014463.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14463 16792 bytes