Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff86d9fd886f4ab…

MALICIOUS

PDF

94.7 KB Created: 2021-09-05 19:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e206bdac7cd2e2dd4b42159a9463341 SHA-1: 0a791ac775280e6643d5fb6b449d7846a416bc4a SHA-256: 6ff86d9fd886f4abda0e95601499f76c77f5c39297dcf7ab8075afe2e930436d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm designed to host malicious content or redirect users. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or downloader attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://sarica.com.tr/ckfinder/userfiles/files/92156845122.pdf In PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4abba8833d---wavulaputunel.pdfIn PDF document text
    • https://limsurempat.com/contents//files/45540935774.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92e6582f6---24336662465.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/41628626736.pdfIn PDF document text
    • http://djpress.pl/Image/files/bumiva.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/4418902e4e07e5bfcd93eb04836380c8/mavedurulofivobize.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/20800640343.pdfIn PDF document text
    • http://beateromer.com/bilder/file/mazub.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/51941739775.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/37836189625.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/49674639825.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/8151468440.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/13075835817.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/mivej.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/disuminobewixo.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/makamege.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9b7ddedd---ninabowuganofudivevuz.pdfIn PDF document text
    • http://newworldss.com/uploads/file/rorimetobosonubugelas.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/9d2289172f887591c328419a289e7bd9/kamedulakezode.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/61638333076.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/lteq84g6887u8jncaptk2i5ice/27470352682.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/90770330299.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/pemaxowezivuzivowabexome.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/madul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=is+congress+capitalized+chicago+manual+of+stylePDF 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_off0001088a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088A 11292 bytes
SHA-256: d9ea596cf2c2d67081c8c84240005adb761c9005db1c248f13646adf23c9e4e8
font_01_sfnt_off000122bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD1 19128 bytes
SHA-256: 28c23582f7820f3444af6fc59c992e4ad2c8f4f550c5da7d8d6fc5d4b82b1f89

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