Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7de1d359fcc5b3…

MALICIOUS

PDF

115.2 KB Created: 2021-06-26 05:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ce72e5061bfd465f06c7dd0a24253b57 SHA-1: e1b91c0b6c10d93f61e1d62c2fdc60b9c3725b7a SHA-256: bc7de1d359fcc5b34e9af32f6bec41a40573cbd2b43ab146bce1c2eef5f4c2c2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to evade static analysis. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://inwebjor.ru/uplcv?utm_term=nfs+most+wanted+bounty+cheat+engine PDF link annotation
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/b48a03f1fd0a945493b1f5f8395881c7/mudanumi.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ip7bg2nm3fnatl2ua1ntgo9du1/xevililubogig.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a928af4b55b---94125362756.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a892035e07a---75210438572.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/16701324055.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/91411619994.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/c4bdq9q2q2527ja48c2osa4mf4/9604847374.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7aa734774881e8edda67e3d04eb3f715/gugej.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/52162184240.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/53832817510.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e41caf1b22---jogajeru.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210515065803_681816804.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a861be43b65---vikufavufeximogufoveb.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/d51723ddda06d4e9bfc12fe91814a620/vijimasubuxoloxivasu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92926108a5---vesakedunibuxuf.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adc05e3f20---getozitisamijuwadajaranu.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/35869159956.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c542daf753---20252712309.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/43c37254eef27d2d35ec103acf13a60f/28384213709.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/sesopomoxelufiwozojutoxe.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607600cdf3e86---natidemigu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8329cd31c---fugajakunegotow.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/40973029382.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/91122713688.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/4e084c143b951d4ec50c4c11092f0cd2/50069999476.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_off00015784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15784 20560 bytes
SHA-256: 0aafcc5afc3ffc3b879e9bbe5bbb87db4599c0cbd8a90b7abcf37df5eba671db
font_01_sfnt_off00018b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3B3 11196 bytes
SHA-256: 2a5837d50e66b43be64d542cf6e0d7b4b765eff21827ec06c40e51b0fb87e0bd

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