Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7532d1e77b47baf…

MALICIOUS

PDF

96.8 KB Created: 2021-09-08 13:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d00f98a855bb4785ab8e3831196513e3 SHA-1: 72e6e92fb0f9869dc698f7afda223e588f5b11f4 SHA-256: d7532d1e77b47bafc5f34817569a9a6a32c75573ccad2068d90cca79b3a92f16
164 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability for execution. It contains embedded JavaScript and links to compromised WordPress upload directories, suggesting it attempts to download and run a second-stage payload. The presence of multiple disposable hosting links further supports a phishing or malicious distribution scheme.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://madmojo.com/fckupload/file/92639806824.pdf In PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b8b687fd---92829546550.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/11043029027.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/durekosozulogikozokujex.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613021b29b395---rezoropofomezusijuvidavo.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/xexonefipefov.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/39397557912.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/86956432909.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210906044938.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/43207974399.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bb14051e4---40926903059.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/13965061205.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/41057418539.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/notovavubewepapiforoxujet.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210905050013.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/fipexitunub.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/68246251841.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/wuvowinozugize.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/98289795386.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-2/20210902111619459130.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/tejajolujukuvafijowoman.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/tebivolugemilo.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/88890091868.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161365b5b44a2a---kaxugit.pdfIn PDF document text
    • https://auto826.com/uploads/files/vokukedawoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=saarc+pdf+in+tamilPDF 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_off000118ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CE 17404 bytes
SHA-256: 65338852bf6a91819e0fcdea0aa36d8f6bef24913feb724c33d69f6093359e88
font_01_sfnt_off000145d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF0 10436 bytes
SHA-256: f40b045946215382d383c0b268b4fb9b1390352a2698afd068879abe590a5357