Malicious PDF — malware analysis report

Static analysis result for SHA-256 1680a878d4767663…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 21:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 83578611645199fc14c1d9abd5123db0 SHA-1: a0badfb26e8d3e06543e9b542dba99a42d4a2486 SHA-256: 1680a878d4767663cbb88a7dfe6bcfa88353304d4f029b127cb701193cadb929
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified by ClamAV as a phishing trojan. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to malicious websites. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://laborke.ru/uplcv?utm_term=do+android+sheep+dream PDF link annotation
    • https://vanphongphamhienluong.com/upload/files/juselefejutagoxegebalaz.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/66633861406.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/88308379514.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/10955470401.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/ef888d82ac31d6c56b741cb4088da86e/newoliluvifeduwunojena.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139523a06cb8---lesuxeg.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/valojodizanoxuwejit.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/ronopazebivikasutupavika.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/61633721424.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/nesofonisegiziwakixefu.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/66197467017.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8bklaq76gpp7dhfq4er8649har/xinimoxetinowa.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161476883a4f87---fanunitodovulokojifiwovav.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/weraxetepawufaba.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/76527226360.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/d4bcb1d3345a0f803a34b24738d36b1e/sumujogo.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/sasijapadakoxu.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/metamipobozuges.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/u65e349rjtuaglgfcoang36oau/joresivibetazezana.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/9755950839.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/gofujalubefenubupu.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/99246282051.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec089cc17e---50324091173.pdfIn PDF document text
    • https://frisch.ro/files/file/84590289212.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/xavinuwixusomiremok.pdfIn PDF document text
    • https://lapakunited.com/contents/files/16130760755.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD15 10516 bytes
SHA-256: 0c24ec55d55e86848fea9918a9fbef35c4b630c7f72f758915aeb98c123ee596
font_01_sfnt_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 18916 bytes
SHA-256: 0a8926c3a574c81bf1eab14d70a6138afcf1a557d024cd9ae56fe61418b65a9c
font_02_sfnt_off000125ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1