Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b5556418924d1f…

MALICIOUS

PDF

139.1 KB Created: 2021-10-05 00:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cb1141fbc43b12f1fbdd676bcecced80 SHA-1: 0956c064597acafadb0326059e09e498388ecfa5 SHA-256: 58b5556418924d1f95819e6b7bd653e936383201fb6043352cc1553a3f0cba4f
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 websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://infrive.ru/uplcv?utm_term=planets+my+very+easy+method PDF link annotation
    • http://markasib.ru/ckfinder/userfiles/files/80648821764.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/wesedezu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153ed79ca583---341995330.pdfIn PDF document text
    • https://togeltop.com/contents/files/digojamep.pdfIn PDF document text
    • http://es-iyashinomori.net/yamituki-n/uploads/files/40731074049.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/90676802963.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/romazefitiji.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161563aac3ecd4---22535935060.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/mavuzokoxowitobu.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/popab.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139022b9c62a---borowebeweniteberasoj.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/29786484499.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/gamunuxawupej.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/xazawejufaxuxig.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/metituwof.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/kukudikotusob.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/44102042715.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/buvakuvagutofigaxujutofez.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/nofolekexux.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/fonuvabuxuretoxi.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/26392218506.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/wolalodujikurokiliteso.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/kidesaxema.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_off0001bab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAB5 10604 bytes
SHA-256: 4f0cd2b063408371f30060262b01493e3ed57a685f01dac3eb155cf6fd29a6e2
font_01_sfnt_off0001d2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2CD 20056 bytes
SHA-256: 09e103b77860a58e3ac934b1ec1fb9f80095bf8d65648042139146d4f522af74
font_02_sfnt_off0002062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2062A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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