Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fc17ebf7c46e5e…

MALICIOUS

PDF

87.1 KB Created: 2021-08-18 22:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 78229e32b746a8a8de334554c535ebc9 SHA-1: 0747d6f056adf4297cb9d5f872604943e73193dc SHA-256: d8fc17ebf7c46e5ee6f396d40b10f4f5d22b24ce93b131fa8afe46d69c1e4dd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://archism.ru/uplcv?utm_term=vpn+proxy+master+lite+-+free+secure+vpn+proxy+apk PDF link annotation
    • http://canvangdientu.com/images/file/24211932967.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/63149829461.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/jinajikosadu.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/fixuvisirivofosuputij.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/zipofupofivizogotop.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/f1b68df44162f546f74de5141b2e7d00/dawowabelijuxewigajilod.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100795e39a6c---32579186168.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/23675007899.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/97698001715.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed94b6ff28---boloziwino.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/7fa5a2c66eea9c270e77f924a4377ec5/dumozesevos.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/farutafezegenonukoroge.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0117468ab---gerodubogar.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/bijuwevis.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/zijiwujuvosuve.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfdb94044b---33507926174.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/30005903044.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/10042267006.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/65881346987.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/24711294316.pdfIn PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/65449962018.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBD 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off0000e53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53D 11120 bytes
SHA-256: aaf9ced215e79bd4ccaca189a2e0f72e848165347850be57825b2fa15d1d0e40
font_02_sfnt_off0000ff47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF47 1796 bytes
SHA-256: daf3fbe0cba00f0eb301d8f23b310ccf9991c8226251b6b39c13cd33534185af
font_03_sfnt_off000107b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B8 17284 bytes
SHA-256: 2372389e25598060ea11e5b7207f0016b5be35e3600c58896334dd8bd528d236
font_04_sfnt_off0001352d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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