Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9eb6f2805e5e6c…

MALICIOUS

PDF

73.6 KB Created: 2021-09-08 03:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0fbb2c14c4672acb2d02a3f3c5297241 SHA-1: 587d40dcff91c73d6eb56dd2462f953be5547598 SHA-256: 1c9eb6f2805e5e6c721978586c97c42a112ceda0dedc54105def138ab0920df2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of external URIs and a link farm indicates a likely spearphishing attachment used to deliver users to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c04080d6e72---fixamugenirota.pdf In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0f13fba1369729ec054863505d38311e/68025697978.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/52743170826.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/goregiwosopasivibixusur.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077944da1461---kosolasusifo.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/wekopetesusajax.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/52887570981.pdfIn PDF document text
    • http://fitviewer.biz/files/file/83638118278.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/087ebffe2dd2a8a70b171c0f77463f99/86192755502.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/28712365048.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/xiluzarufalobosazomike.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/fugosejitelixixalotut.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16135835fdd1c2---7356560599.pdfIn PDF document text
    • https://viettrungson.com/media//Files/laluxonejonuvumikovisegoz.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cb1768471---mibafokufag.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/wibevatujazapuned.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/24948856868.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982949889fa---rubibuxam.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/tevuseretaki.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/ef3e3a3234dddf85b1e1cf6ceb4b10e6/71141445912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cobra+walkie+talkie+instruction+manualPDF 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_off0000bd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1B 10840 bytes
SHA-256: e2618846702df6a7f52014e5674b44f11a4dc59a821baa65cd4ce7a673d6cbf3
font_01_sfnt_off0000d637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD637 16556 bytes
SHA-256: b395bd26909ed09bd453a45bcd05b706a1642f3de4ec8ac0150b7372f7656341
font_02_sfnt_off000100b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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