Malicious PDF — malware analysis report

Static analysis result for SHA-256 834fa287dcf8b835…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 09:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 505da92247640a66ffd857a5921aba99 SHA-1: 4d0077079497a419b33c15e8c763ab92de36be0c SHA-256: 834fa287dcf8b835d9020247279be6528a79cfdb1b90005197791481d32cb7dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious download sites, as indicated by the URL containing 'download+earth+apk'. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://nomylo.ru/uplcv?utm_term=download+earth+apk PDF link annotation
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb44abf857---42604208935.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/patavuragitegideza.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/49757555304.pdfIn PDF document text
    • http://snft.ro/media/file/zuturawaneta.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac5086401d---wovogabaragasozojibugowu.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/38401320084.pdfIn PDF document text
    • http://surestegc.org/documentos/file/46524609254.pdfIn PDF document text
    • https://baglab.pl/galeria/file/2146110937.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/44257243794.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362d3f8bd2d---92052898309.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/xuvokufidajiwawupeg.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/11213355750.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/21765097255.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/wuminoduse.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/53193991090.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/30951405716.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/77661846475.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/bokenekezak.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/pakenaxibu.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/nagavowijugelu.pdfIn PDF document text
    • https://menu2uplus.com/images/file/40207126305.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/14096013800.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/67000232124.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/53104053709.pdfIn PDF document text
    • http://mega.kz/media/upload/files/bafogelefogilepatap.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/lemizonak.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/35018816244.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/48697989709.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_off0000d80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80D 17592 bytes
SHA-256: c82fe0fbc90eb16a8facb9b7b49982d491a5e70c6c6e54295291f8384bdba3e7
font_01_sfnt_off00010562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10562 10408 bytes
SHA-256: f7fbc241d7d9251af04655bbafc57ffbb8e17ffa183b2efda8981c2bdf681e92
font_02_sfnt_off00011ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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