Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61d1bd76980645e…

MALICIOUS

PDF

91.1 KB Created: 2021-09-23 08:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 97bbb060a32deee0cd47eb9add6c3d91 SHA-1: d329d20b5a8081b7f374f2b7768feef0ee509e70 SHA-256: e61d1bd76980645e81c3b4a2759f9c1cbdd6566153357b4ce276d34d72bd92eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains an embedded JavaScript stream and a large number of external links, many pointing to compromised websites or link farms. The presence of JavaScript and the link farm structure strongly suggest an attempt to redirect users to malicious sites for phishing or further malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://huntic.ru/uplcv?utm_term=how+can+i+get+free+robux+2020 PDF link annotation
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/pmes4vrbkm9fm01c5tp2q382fk/53461467185.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/wagakekoguzafam.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/90699532043.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/webipitekijomozunobuxez.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134dcca068d9---28871908586.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/7859640931.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/45134815484.pdfIn PDF document text
    • https://bandloc.com/FCKeditor/file/92498426933.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/gadugilopefipewirubotij.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/kobafe.pdfIn PDF document text
    • http://topstec.com/d/files/49948523176.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146198148d46---larupedipamafukoxizasupi.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/rifatepot.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614490885e6d7---foparoserezuwumiponewe.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/mepananudemijexog.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/87863711384.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/kidejonijitode.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/manebidavegekivevirinozig.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134dc0d20aef---88023951508.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/82064958556.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/ruzivuviwoxapeka.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/golojilixiloboremepo.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/robibujit.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161416616398d4---62096490199.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_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001152e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152E 18236 bytes
SHA-256: f0981679ae2ee6fd0251ab330348fc150f8e11163a46f2393adf139aa3345375
font_02_sfnt_off00014503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14503 10956 bytes
SHA-256: b14a000a209fc67d23aff657639980d6d235162fab202fad99ad1996045dec95