Malicious PDF — malware analysis report

Static analysis result for SHA-256 1260e2c5c1eae621…

MALICIOUS

PDF

98.6 KB Created: 2021-10-18 03:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 347c087cf925e6bf44a8f60c3a8c2c52 SHA-1: 3404b679c06afb0cd14856f5b1dd075dbde4bfa1 SHA-256: 1260e2c5c1eae6213e8d5287f8b6b7440e75ddc40ffb3f631bf5a7f8ac973f0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. This structure strongly suggests a link farm designed to redirect users to malicious sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/84468aeaab04b40199f352cd31bfb258/xajebuziwonojosotibasapa.pdf In PDF document text
    • https://suruburi.net/mm/file/vatifum.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210927155430.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-10/file/LwpCms2021_10_14_09_33_54_4392.pdfIn PDF document text
    • http://berbun.com/user_img/file/bepabozaparedukibu.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/99554208647.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1616a2849a3bae---vezosalidobobigumug.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/juropiludureb.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/18563320176.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210923141458.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/49823674130.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ln7jnljg7hbs8i2tn6otl777n6/76086637105.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/74035780831.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae0d129e41---konetapabufa.pdfIn PDF document text
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/garakadonabivelolasavuwa.pdfIn PDF document text
    • http://qdjshg.com/files/file/90846446657.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20211007_3C15D00C1F71D093.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615cf69d98a9c---saropibelagegapirisonaner.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/491fd3e61bb436f1374537712d49f605/vekeza.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/50000061059.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/53711688595.pdfIn PDF document text
    • http://ume.civilkozpont.hu/uploads/file/jozena.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/oscUj7J0Gjw/uplcv?utm_term=how+to+get+paper+in+hypixel+skyblockPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD071 16284 bytes
SHA-256: 5123e84cbf5c73af8c395ad6df520a652a98704310feda58dddb70c0a6f2f28e
font_01_sfnt_off0000e680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE680 11176 bytes
SHA-256: 3282492a61dcc95c83ae72481deeb80d8dcb7a888474113912ec8c9574fe6e2c
font_02_sfnt_off0001006c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006C 27448 bytes
SHA-256: 953bd9c46cef1659e7d6a51f9d5ca7d733d77a6366fbe97b5c0b925c9467bcdb
font_03_sfnt_off000142c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00015ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD2 9472 bytes
SHA-256: e6ec12fdd5263b15a5e57dfc631328a9e2e8d12f25c939f5b5ee699866ed9105

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