Malicious PDF — malware analysis report

Static analysis result for SHA-256 94028b2cfd3a510c…

MALICIOUS

PDF

71.9 KB Created: 2021-07-05 16:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d1258478a8ef525a1cd3f57ed3dfc081 SHA-1: 268fc879f65d3d8675c737f579120285b947d905 SHA-256: 94028b2cfd3a510c7bc66386062d000e294d0637cd5c9745bfa0bc5b2785a384
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://drafthe.ru/uplcv?utm_term=types+of+quadrilateral+with+figure PDF link annotation
    • https://csn-alliance.com/data/files/16057912399.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/30069927250.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/40bb81a3ce91a648a4a11f1513f1191f/zavijidezuroxovuj.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/77rjeij8huvpjuu0mep9t1co15/64401773193.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078a07a63a92---firakofoziwugupubijax.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac0022c650---35702029690.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9cdcd7b72cf672527db6d3ae415b145a/83198714665.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/zopagorogewifuxamon.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/pebnuv1jomhql9p9jbp6hd8keo/44522649725.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06d25a65de---vojivupo.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/nabuk.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b992d652a93d203975c2d54737601539/91447983968.pdfIn PDF document text
    • https://mmszke.hu/files/file/duwufiwelowulip.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076e99a8022d---binogezo.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/7a8c610c801296b864120f6a920ee245/46233585439.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/72424928171.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070710643b51---ladisinufusuro.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/85d4b053101ddbb99fb7e97468411a5e/61727288358.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/c4c86e7a356e7ee71ab6cdb340d2307a/81082658339.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/moduvugesiju.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084a984591e4---puburaket.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090903542422---52421367825.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_off0000b77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8C 16024 bytes
SHA-256: 9936067fa7165a8ac3ea3cdb84f5e51a764db810cc09159dac4993d63d38409c
font_02_sfnt_off0000f8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D6 11084 bytes
SHA-256: 3ea62b27b8ffa5656049ae3be9426be9a51900c00d5f24260c720f71dbc69154

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