Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21a594b2f0d85e5…

MALICIOUS

PDF

100.5 KB Created: 2021-08-08 19:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b5bbbb31195e51a7b2748e260a8c99e9 SHA-1: eb8524a31db8ecdb439bf3c897f7fd831f4d3a3c SHA-256: f21a594b2f0d85e51a23d8429822154ff20d9f2690561ede8d65be1eee1c2045
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://garglob.ru/uplcv?utm_term=super+smash+bros+ultimate+unblocked+66 PDF link annotation
    • https://paeonia.ch/userfiles/files/61212249229.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/2667d3e6336bf5d6391ad12ad7f93f91/88289891379.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/xigigetepe.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/5092876261.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/8schen210ve0tqg8239ucl9tf5/fomatulule.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebc7a114b0---44789561349.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/56453832373.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/tupeboboda.pdfIn PDF document text
    • http://ridendo.cz/files/file/fubodinarapamejemolo.pdfIn PDF document text
    • http://patroha.hu/file/58123637202.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/52496575873.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/jijowofovizogubenijos.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607c010543945---xufeduruvoli.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/f59e5780438a9b006d689153b87e28b5/tigojapise.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/15606764045.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/lazinotoxidugifokaj.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/worexun.pdfIn PDF document text
    • http://apvn.info/userfiles/file/37802094441.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/74742068327.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c002f342c081b410dbb7b191abe47adf/vanisifusa.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/58259908824.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60c7bbf874---20164981180.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/84978891047.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/77831618804.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BC 1932 bytes
SHA-256: 78b0a163e4eaea4fd1c276a6e09b3ffe8714eb7cdf5cd8e6d31ca7f4d18684d2
font_01_sfnt_off00011f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9E 19644 bytes
SHA-256: 2b2a820fe5a16675df50c7552332a86baf0f2a252a1b32bc8bc507ac1a6153ab
font_02_sfnt_off00015152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16969 11352 bytes
SHA-256: a156677ae885b4710070aa757171c4b4d0189e634fb26c2a0ca1a672749203a3

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