Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ff613ad62b126f…

MALICIOUS

PDF

98.0 KB Created: 2021-08-09 05:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0afe72025567a8a08d716d2e6298e41c SHA-1: cdee0442f03efcab9ae94440e3fdf07954ee59d6 SHA-256: d5ff613ad62b126fed7f0fd89d3a05bc73eaa246d8b9f2b4df8a2da707d58888
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to distribute phishing content or malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 https://yingzhaoliuart.com/upload/file/53084795206.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d85356e9bbb---jadalofidiwumekekalil.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210723054328.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd38e677c3---66418296970.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6605bbf1cc---52814561175.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f269eace---98274437704.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/94679328373.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/0d3aeb5d6ec80d7a5ff26dfc1321cfb5/66414643742.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/40818269468.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/zugoxokefivuputunonose.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/pedudibe.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/bbjks3p061s4fl5hda5i3ibcv3/44481473238.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3v95ik41tog4flp29tmbb6ui20/lamajajoximub.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1610589b1597b2---gagukomijewibapojip.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16256152061964449367.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/87800015915.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/jagirevepularivumuvekuni.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/muveju.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8ecfdecd9---toxoka.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/wexabogibukonawepe.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba4a04a843---45117782057.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/ferasobokisot.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090f6dbc09c9---rugibizazafomiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+much+do+private+pilots+earn+in+south+africaPDF 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_off00011018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11018 11128 bytes
SHA-256: 695dde2ade2d45315e25faba51249e8f13bb40bf7b5b2465fcc70f2916c9e7ab
font_01_sfnt_off000129e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E0 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_02_sfnt_off00013214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A26 18056 bytes
SHA-256: 595029301e41445c2602529ca1a0d9ad9d1299f1e7f1951bd7eb19cd060f3ab0

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