Malicious PDF — malware analysis report

Static analysis result for SHA-256 014fbe34873ce680…

MALICIOUS

PDF

72.3 KB Created: 2021-09-19 13:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f040e42ef2d25a5e0f70c5a7d1ebceeb SHA-1: 10dca0df97f9aeaff9e7de1f0fe0a496a99b13dc SHA-256: 014fbe34873ce680cfe3d6a3e146913da3b0747c3a912b3a9d6563dd3f3b0b0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload storage or disposable hosting, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://coretry.ru/uplcv?utm_term=fire+tv+remote+app+download PDF link annotation
    • http://kayamedbursa.com/userfiles/file/wovujofure.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/98151037387.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/pixibodarugupebujafabaxe.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/31573603873.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/15620851189.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090600163673499.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/730525651.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143b4724fa04---nesewumodagazo.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/53423640949.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/73b8f7d32e672c507279c6967bfbac2b/tudebi.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/rizanumime.pdfIn PDF document text
    • https://primer-spb.ru/files/files/sifusakopufimup.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gipetowomifagetal.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/lazosivexabefanaben.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc08caa4a0---lugepozubasodokawa.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/89811126346.pdfIn PDF document text
    • https://tsegypt.com/file/96726757229.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd49ebcb67---11836637637.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/monokig.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210908_CB2BE6BCC1D91AE2.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/bdb1848fe61a73757ffa232a9de661e5/xadutavuxin.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/farufonesiv.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/14804044294.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/28156413410.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/xuxozurexikajugime.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_off0000baca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E1 10516 bytes
SHA-256: 5d58d02d4ef02bc73b44098e0f10ce23e5120ae60a58794cdf16a76a6237001d
font_02_sfnt_off0000eac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 16076 bytes
SHA-256: 7941da84c07a548d303fc9f93392745a35f8b86d2841e4270cd64947eb7c594d

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