Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27d6c3510696d72…

MALICIOUS

PDF

74.1 KB Created: 2021-09-30 10:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6e0020bff1359008d5cde7363f1c95e0 SHA-1: 9e7d5418b6fa3cc1e9b3cd679186bbff2ef63af1 SHA-256: d27d6c3510696d72e8ce5afd9ced34ba9c47a4a6520e938771ab3af18ccf01d7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a large number of embedded URLs, with several pointing to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of a URL with a 'password for phone lock' UTM term further indicates a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=password+for+phone+lock PDF link annotation
    • http://ballmillfactory.com/d/files/nanidufimiruxuwedixujow.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/tilijawemelojarotafidofes.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/nizawew.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/98750044707.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/xoresi.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/c1bbfb30a2b47c13fcd5fa44859ffdda/gilewenawedurafudefirodiw.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/25282102493.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/jorifenagebol.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614c694d59975---vujolut.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/menodowowapujuvuxazuvoka.pdfIn PDF document text
    • https://egca.fr/userfiles/file/xexutuxuzefadan.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/22995023259.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/renukumezoke.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e3da686c3---44990863680.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1632118786.pdfIn PDF document text
    • https://superpart.com/files/jirarokirizoripumijefose.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/mofuzovijoniziwixufepi.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/lisubovegupipelemozan.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/fovexelitoremojepix.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/50233582210.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/fafukirawosemu.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/tasexitifepuvo.pdfIn PDF document text
    • http://starma.pl/files/file/51464283404.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_off0000bba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA7 10704 bytes
SHA-256: aa64f79ed93326ce7930e32a45f3d4446c58aa1a34b956aec4f2b6b375247759
font_01_sfnt_off0000d43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 18072 bytes
SHA-256: f8a4a42d29e1ad20898cab3126c1001e9259faa2fd563498dae0689c871fc241

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