Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf2e7aea555b027…

MALICIOUS

PDF

85.0 KB Created: 2021-08-01 03:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1f1c987e938aa18db98e038b0366637 SHA-1: 3d96d0c7c4b09d0992d386baccc8828deed3a463 SHA-256: dcf2e7aea555b02799e15dadda41fa26982c2e2dfca965f082320bda44387bc6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://stardentalcare.org/userfiles/file/82724336413.pdf In PDF document text
    • http://ilksolar.com/Images/Media/files/xaxaputezuvabamajowal.pdfIn PDF document text
    • http://maydangson.com/vietkiendo/upload/file/57404330978.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/vasapevara.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/aro3jmcaj8tplof3g41taec610/nivujigejonir.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/18117667958.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/jizijawakugazegumamete.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dcd2f19af---xovifilukufimadozipabis.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/vovatosuzokuvoxuluvotol.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/29762336271.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7a7de936b---batosopafelatazavag.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/lororonadusewexegig.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/18188816686.pdfIn PDF document text
    • http://airmon.hu/images/files/kowadoja.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/82720032137.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160add2628a4d1---19358937767.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/tmri81n5ssg9rtq85n8r8k6n33/pizolopeg.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/hu3pj6qhg0iif1aick4jj8l2pp/kovomifiwa.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/nukeladufejowiwadazunife.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/jopeginebesemizawo.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/sumipelajevivexim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+create+a+new+branch+in+githubPDF 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_off0000e70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF20 17636 bytes
SHA-256: f70c74be38ea71fbf9bf512737c7b2119cdee12e1e6701dda2d8a2150b08bea8
font_02_sfnt_off00012e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E17 10612 bytes
SHA-256: 45f680997aa11741cf34f92055505fc0a4ac9fd4ea07ab258e52048714e81584