Malicious PDF — malware analysis report

Static analysis result for SHA-256 4798f5dd3117d480…

MALICIOUS

PDF

86.9 KB Created: 2021-09-20 21:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d948bf435cb6da3b41736161dfd756ee SHA-1: 3bdaa72820b627490d4997adaacec20cf4d14351 SHA-256: 4798f5dd3117d480a831176e155d7582a916f0542984ba5edd45be93f38c2647
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to multiple disposable hosts and compromised CMS uploads suggests an attempt to obscure the final destination and evade detection, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://zawodydrwali.pl/app/webroot/userfiles/file/jugomimedo.pdf In PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/zowufamoraw.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/vamuxazubikivujupa.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8299f5c3acffc63fb99d654b7dfc0042/sunawuzopasupezidiro.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/bofafuturugolasopun.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/xuvosunaxewone.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/90677714395.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/mabitituniz.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/27130804715.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/9idhq59qa458f2ahql6541fg80/12277697675.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/nowigebamopetuwarega.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/vesadudesaxis.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/xazaxatuki.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/guxiwebupalarafarolufobab.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/45352532324.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/hp4h8fs1d4o5v0mbi8ktijod5i/mebuzitifojipowuvawe.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebee56a284---sabezajemanetojigame.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/medovu.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/pezexunipamilujes.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/47119307077.pdfIn PDF document text
    • http://agro-partner.com/Image/files/fizugapodokuxinevibamud.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/toripojugegevikusulomej.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/10989142812.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090420302945.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/475252555.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/fidinovupogilakovesibotav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=dragon+ball+fusions+androidPDF 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_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 10540 bytes
SHA-256: 389375d0e0c3054b7ca05131e4b77165d610fb8000720ddc4c2fb352bf91e8c9
font_02_sfnt_off000118a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A8 20084 bytes
SHA-256: 2b6949d25a96be92aa76caa48309439c3e302f25a2e9198db2e837b49d812a83

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