Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73293120d4cd101…

MALICIOUS

PDF

90.9 KB Created: 2021-09-07 19:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8a3549ed1efca6971c83f60f50b99dfc SHA-1: 3afa794263a2349588f12b42ac3e2b6d9eb4dc39 SHA-256: a73293120d4cd1012673292e32e05e14114009886d37d8fca255b228fddac86e
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript stream and the presence of numerous external URIs, many hosted on potentially compromised or disposable domains, suggest it's designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a link farm strategy, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • 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 http://jar-ted.pl/file/lipiniludomipamawip.pdf In PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/p3jtfpdhh06prd19po8se0vh61/58437715007.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072577836ebb---nerinibevonititaliz.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/f12db2238265292d830d5e19e15e0e98/96168302720.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/jefemelesejijekowom.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/50120735669.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/meravupuleperazu.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/77211171060.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/10030116258.pdfIn PDF document text
    • http://jngf.cn/files/file/memamujapazufalakabug.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/d8eb3cf38a7c2a19349f5af9441c47b6/kitevedamomojuw.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/90579043585.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/jojejomas.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/171944172503.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fbef282f304f5e672ef473b7d0fd118a/ruperekujedufok.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/77158672743.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/9008b729567cbd9ea51fa1c9d759bdbc/kidezosoberonomifagijev.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/44266473370.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e273d4b8eb---7206850647.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/d93a44abdfc46bbde5adf093a7e7f211/subugufatawepixojenovefax.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210827213329_9l3nhy.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/disurixirejusawabifotiru.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099b40d5ca06---begogebaxudepe.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/kakimarapupejifefozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=forex+trading+tutorials+for+beginners+pdfPDF 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_off0000fbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE7 10992 bytes
SHA-256: 078fc4803195d1979394722b45c9e35712616cd35e3c6038d3b361e4d0c15707
font_01_sfnt_off0001151f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D31 18972 bytes
SHA-256: 802a6d9bc58b6d728369a8e0a4b7dc922955348abf765d20e589b27e23db692c

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