Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7ab3b124331765…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 08:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ebd1438919517a465e1bda3e6413c501 SHA-1: 74699109e947b43eb380de94b0b7469e1b4f8149 SHA-256: bc7ab3b124331765b1a86125be702d93bf34a7a2cb32fd640b5aeed6d39d4bd7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the document's structure and embedded links are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://drafthe.ru/uplcv?utm_term=naval+strategy+games+android PDF link annotation
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/losazezamafupawipomafatak.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/3lfk7nnh6b70r6bea3ieq98h50/fowajupovotumag.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/14953664491.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210924_B27F738D28B5BCAE.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/womekaret.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jasuxetesotetosixezeme.pdfIn PDF document text
    • https://greenways.at/userfiles/file/36049880053.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/pokuvuvasuvezuruvafob.pdfIn PDF document text
    • http://billsky.ee/files/file/ruginibos.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/gisorujerumuzufududip.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d1bcddb1bc---soxuwirim.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/zororojapurezabid.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/1503359223.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/37070906066.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/5638936572.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/39095863182.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/99145600245.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/60771042226.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/kuwizemadipibuj.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145262a343a2---88434491412.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zoxidosazanakunego.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/nusezisiniloli.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_off0000b05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86E 17296 bytes
SHA-256: b15221dc0959f780696a11ffcfd170b0fea17733e0981d71dc0aebc5d5c23d7d
font_02_sfnt_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 10748 bytes
SHA-256: de33e8a827451aa28fbe254a500f98431d4eafae0e38ca0146b05026dcdc0c7a

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