Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d93e2a7d2f70b0a…

MALICIOUS

PDF

86.8 KB Created: 2021-07-03 00:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 107a11bfa4ed29ae4944df7fce8cb6c2 SHA-1: 732532a526ad182a58c6a338e4cf3a93870d4d01 SHA-256: 0d93e2a7d2f70b0a6596f9285deccb613e23ec979f4f7b5d947029e3037989af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress sites, suggesting an attempt to distribute further malware or conduct phishing. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://autowagon.it/userfiles/files/todivurosewofir.pdf In PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/96675934052.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/jg5sfduq2strevck50v2r9fl09/nizatu.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071d19ef1835---saselutilovivejajekoz.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607f30d5288c1---23534811952.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087181e165dd---35040262091.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a997909d76d---nilerepebe.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6ae991d324c795d39e70124eb1e75f50/60300295738.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a642a2563cf---82674451443.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/23016861577.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/85111027608.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0df6c9ad2---zoxotogawugelederog.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78efd9c18---15726346753.pdfIn PDF document text
    • http://landpas.pl/upload/file/salamarevok.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/1rsf70ov1q7ijqjh9l42lq87n3/sewusogikevenimix.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/2327149016.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021070303531373499.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/96484768732.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/bmov2i75i6tctnjrhoko97etia/33907726423.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160addd8d689dd---dibepovivagosubofumogifum.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/duxedojibuxejixuxafetep.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d2f006f98---7115695738.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/kovasasodemeroxin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=introduction+to+molecular+biotechnology+pdfPDF 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_off0000f038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001084f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084F 11204 bytes
SHA-256: 08974d103f82b508b696d486b24834c39ed7775f8b051f9023b6bdd98d8aa39d
font_02_sfnt_off000121e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E7 16616 bytes
SHA-256: 8f902efb778c6d20247ddd362b4cba7d4ae6a26e39812279033a42ee19e0a61a

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