Malicious PDF — malware analysis report

Static analysis result for SHA-256 d080a487cc9fd2d2…

MALICIOUS

PDF

88.0 KB Created: 2021-09-11 02:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b47e0647118d675f8bdac28164879dfd SHA-1: 754e4a755a235711eb5cefce13027e0baf937a0d SHA-256: d080a487cc9fd2d2efaace3da88b05f1d5683213caf76112fac222a1881b7c0b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a social engineering lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://rbtyutj01.com/userfiles/files/pozogejikegarewosirawafaf.pdf In PDF document text
    • http://geomanteia.com/userfiles/files/raretad.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb44f4da53---71118668917.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/16901695338.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/lixuxisofudako.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/28286735004.pdfIn PDF document text
    • http://handgun.ee/media/file/nelopuxukobitasebekozet.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133755387e34---peziluzipofamejojoje.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/kumivaregunawegi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/27dcb11963b61be6a7438a2f06fa65c9/jakifojatijani.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/zuwovasusagifileganawiko.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/vifituwetafiw.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161382c6cbfb3e---rejogejeguziwuromuve.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/kemotabajud.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137cf9db1033---mekavapaburepixuji.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f80acab230---barod.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/3489588604.pdfIn PDF document text
    • http://slsnn.ru/content/files/557346613.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210908222210529.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210902_4671A7DCCD78D289.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613beef46a463---tafivunepinonut.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/jesibude.pdfIn PDF document text
    • http://4yoga.by/pics/files/goritef.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/winakorupalud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ppsspp+games+san+andreas+downloadPDF 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_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 10632 bytes
SHA-256: d716f16d58a1c3196ea3d7fbeec97b4a77e13026cfe51ae5ce58d78dbe6223c3
font_01_sfnt_off00010cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C8 17424 bytes
SHA-256: aaa16b7166a4d9c048746489f1770268f59563937c11816361ea9c421dd0110e