Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6bdb784b69851a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 08:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 04720e9e44aec7bef1720848e3e8f65a SHA-1: d19424f0a0907bbf7eed5ac5a41c18f02455cc0f SHA-256: 2f6bdb784b69851a3ecfe218016fcce5daada80a6bdf9c04532856bde4aad382
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The embedded URLs and the PDF structure suggest an attempt to disguise malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://baobiachau.com/luutru/files/xamodis.pdf In PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/xalefiwimepametumum.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/60182909380.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/xuzedizuziti.pdfIn PDF document text
    • https://kuepancong.com/contents/files/13256638799.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/jugozulukogosasixovodobu.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/zenusesafovapovura.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/97671927152.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613215a33744e---82152597335.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/sitopudorideberegileb.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/vizaxij.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161427f640c833---bixigozexupe.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/tafabuvugonuzezotafapan.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/veragol.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/36322489059.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/nikepuzazux.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/88337299568.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/30127875136.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/pavos.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bb37609e7.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/32154776120.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/47266891459.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/61571775179.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/nezifaxis.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/titegujavutudak.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/pewesigezanitosot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=minecraft+free+game+on+mobilePDF 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_off0000dded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDED 10644 bytes
SHA-256: 7cb8c5b3dfec00a14a716c722af22fb43e064a6c67e36d79618c5040d1c68831
font_01_sfnt_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 18344 bytes
SHA-256: 740b1418d62d779efefb81c9d13c14393325edc1bc03d7c63c3ea35a86484271
font_02_sfnt_off00012588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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