Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba96633c0417f93…

MALICIOUS

PDF

73.3 KB Created: 2021-09-14 02:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 23730fcf23c3ba920fbd2dba65019585 SHA-1: 4043c42dafedc35faf9e7e6f4521885eec397d8c SHA-256: bba96633c0417f93f929c34f2c98d8f59e7b113a63c26114d499e9712d375d95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://synerhu.ru/uplcv?utm_term=miui+12+duplicate+contacts PDF link annotation
    • http://originalcheck.it/public/img_admin/file///zinudigusoligiregawapufeb.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/36209045461337f4ccf96e.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/53554585501.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630635360.pdfIn PDF document text
    • http://fpole.ru/sadm_files/nubupezovopoxikegufiwok.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/79519746567.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/99722379361.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/fejiterovuramufufisazafag.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/35587368829.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/vavivivi.pdfIn PDF document text
    • http://mc-opony.pl/files/file/xabobow.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1631570615.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/24209240147.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210906_7B378A9CE053E30B.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/23112842093.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/fijotanenotifup.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/27859714842.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613866e18e036---82917709417.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/kofuwipadebufip.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/686295688.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/38832284491.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/62557665011.pdfIn PDF document text
    • https://eternalbliss.net/file/59325525779.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/jd6p3brvh13f5tn9pn7qub7jb2/pumedorifudefid.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/84934603088.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e15cd906e2---nimin.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16134d16a531e7---88223126043.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5A 10672 bytes
SHA-256: 9e45bfea61d5a379f7ad7817780c7b27dcf34928a4692b4eb574ed4311a1b2b3
font_01_sfnt_off0000d609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD609 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 15996 bytes
SHA-256: fd99693048e592ed9c8cbb7be9ae94b96acafe95b6af7738ad3f5b43e89dde06

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