Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d2f11011268030…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 03:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a08b3cb6b07f46498a3140c5643f7969 SHA-1: c770e17258d478053066207574631c423bb77257 SHA-256: a9d2f11011268030e23e39b4cac7f30a20ae4bbe1382e8af9de24e53e22331ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these URLs indicates an attempt to lead the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://philabc.ru/uplcv?utm_term=essentials+of+strength+training+and+conditioning+4th+edition+pdf+free PDF link annotation
    • http://terralis.net/catalogue_dynamique/file/dabirolebobodilamu.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/55507437980.pdfIn PDF document text
    • http://punaide.com/userfiles/files/38864130827.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/cb40e844b522c341c81ea03f329751f0/21554188441.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/rewexorelulawaxemi.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/82902251313.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/nl6ut6grj77hqr7na87lvmfmi7/pokito.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/84209201588.pdfIn PDF document text
    • https://qkon.ca/images/file/50469621578.pdfIn PDF document text
    • http://newcityhk.com/userfiles/90528645743.pdfIn PDF document text
    • http://siltukai.lt/userfiles/file/numuwosuwise.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/33221083425.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/29370255396.pdfIn PDF document text
    • http://zimmerei-possert.at/89697655749.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/74568859908.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/84910724092.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/8a704de450d44053f6e4aae90cbfb13e/41493021198.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/nasuluf.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/fabozulirodupasibuvomopux.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/25jlhi4d1hp54d507q99he4jo7/78540700660.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613852f48a077---vodelevekujofenuwavobat.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/48463405074.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/fubawogupop.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/67074592686.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_off0000af92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A4 15300 bytes
SHA-256: 81af806a20ea45a01fb6ca35e6b800d604d08d7ae935996c5aa75107a5aec597
font_02_sfnt_off0000ed8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 10960 bytes
SHA-256: 0122ebf31bf1c95bf9e0d346434d7d269351c3014936cc7f42380c623ebf63cf

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