Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a1102756f513e0…

MALICIOUS

PDF

88.2 KB Created: 2021-08-29 17:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 37791602f3850a02501ba13ca79b564d SHA-1: e0e748ce5de8b77452674a01a7aa929c49a7a2fc SHA-256: 60a1102756f513e093e116f9d2c2c3022825c97993759a1aced3360d87f26167
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://queure.ru/uplcv?utm_term=cecily+strong+leaving+saturday+night+live PDF link annotation
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7a509e41f---65226541815.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/89457798648.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/19297305b1ed6c8a3e2dc17bcdcb7dc4/90740962053.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/tuf94vrshodqtesi0mivaftmqd/40341647946.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/87f9f9121125990fe1d3b71ae8437669/71552084474.pdfIn PDF document text
    • http://ttc-investco.com/img/files/17021361395.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/aa10a3e74139d4d4e50f84b8b1905e22/97060486444.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/paligoveralupaje.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/e230ebdb62bec1524d1564714d132d29/32705757112.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a96664fa---88616005940.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c14e18a961c---futopozojazo.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/8318672376.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609899c8ed01b---52215781899.pdfIn PDF document text
    • https://rajaunited.com/contents//files/4543242790.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607293ee41f13---siduzelepupolura.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/88473631579.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/damuvotiboketekuropanom.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/vufobasugumabezasaf.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/42943472667.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074888a7c182---zexudevelolaxitotebu.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/apcn3lkieqr7juagt55hh8vdsf/puvexutovorurowolawobe.pdfIn PDF document text
    • http://beiks.info/public/file/83387949494.pdfIn PDF document text
    • https://m3csrl.com/file/bowixugo.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/32282060794.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_off0000ee99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE99 18668 bytes
SHA-256: 69d0c3982b27e84a55a4fbcb91406487052b4a199da228cb1d4f76ad2fb5bb49
font_01_sfnt_off00011f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001378d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378D 10960 bytes
SHA-256: fa829a7d529f152ab679e707a82d5aa6054394521275ac59ba8228a6f1f3bd12

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