Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcc06b0c7036447…

MALICIOUS

PDF

95.6 KB Created: 2021-08-10 03:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 01b6a787735633c908b9d410d97563d1 SHA-1: 043dd189ef60dec2e467d2fe3cb68449031677a8 SHA-256: bfcc06b0c70364471f6395e4c8f2869acd519dacecc869a97ec851b07fae4526
164 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to download files from various compromised websites, likely to deliver a secondary payload. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a phishing or social engineering tactic to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa8169e25---51052921592.pdf In PDF document text
    • http://actlogistic.vn/upload/editor/files/6772750132.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6732a525ef---bixivelupokusojujojexo.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/23dfc5adadf1e79ed773384925fc8482/texofinewer.pdfIn PDF document text
    • https://avflash.nl/upload/files/30037586977.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ske886jherg8s34c0hsu6doe6c/66163992927.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/gogijakatumijos.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31f32437f0---pubirezegokiwalepubivasu.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/99905250879.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/narinir.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/fh68lv9kqptlqv30pk8qrhfg10/funupogik.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0e30a1b25f46aaec18cd5cb65dbcf9a1/23986119392.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/21524689874.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b2db27bcb27240e14e0eb9f66413b93c/46424557421.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54ddc28cd---kizijivelovasil.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///65368833772.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c301b88a9f---livatudelokovuka.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/nevavebava.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/suvegipilejuludove.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/wabogefapuwusa.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160759d795149e---kabezetaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=law+on+obligations+and+contracts+by+hector+de+leon+2014+edition+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 19260 bytes
SHA-256: 8d155687298d9ccbcf08b4f77b2fb19e5c609225e14e8b500a86a179d825ca39
font_01_sfnt_off00012604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12604 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off00013b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4A 11568 bytes
SHA-256: dba6c28fdee7c7437e0ff407a2d595afd177622b4f21c9444b773b686db21ff8
font_03_sfnt_off00015677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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