Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9544314f9731c64…

MALICIOUS

PDF

113.3 KB Created: 2021-09-05 18:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d494186c207e0881f9de9c9823a7abc6 SHA-1: dc781331b6b52ef3d3f5cfe94805c919afee1494 SHA-256: a9544314f9731c64612bef5b1a08616f755f5136b3484355ee049aa250e8b0a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://smidgel.ru/uplcv?utm_term=his+dark+materials+book+3+pdf PDF link annotation
    • https://echipamente-scule.ro/userfiles/file/34016321297.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ace38b6b8f---xanomimug.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/23102549569.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/lezivoxejubaxiwur.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/duluxemipilevone.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/82732819515.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a509468722c---jokuxatutibamusiximuzod.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612a1424cac95---33817861433.pdfIn PDF document text
    • http://www.77ice.com/upload/files/rixojupexufurefominis.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161276d4f74706---govazelasavoloni.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/2054t1e7q09o2bfk1gda57e5av/sawowixarorutegapobawefer.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/sirojenezeperekasokifuw.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/l3j24fp0meh7hkf9ohg1i628rg/72296762246.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/a926a1d0a0ee8a44e2439e4d8939da67/doguxoduxituzufiniwiwised.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1b50b6f01---sabesew.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/64320102805.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/62772545863.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081807695464---11575906957.pdfIn PDF document text
    • http://normel.org/files/upload/file/11291796164.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/64444673132.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/87712973069.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/44484722545.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_off00014f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F60 10952 bytes
SHA-256: aec5a0c9b5701d67dac90235de34d1638a1830c5b126a4ae75e654d34e408a6f
font_01_sfnt_off00016889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001809b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1809B 20944 bytes
SHA-256: b6d33ac8188e407005f0f81457cce2ad28523dcf9272a3d89ae878c96fd8557f

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