Malicious PDF — malware analysis report

Static analysis result for SHA-256 c654a1a4d132d034…

MALICIOUS

PDF

87.5 KB Created: 2021-06-29 06:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: afa94cfef0915a1a1c1a57750f9b4514 SHA-1: c0cb196128a1a89f1ced57230972868016a15d66 SHA-256: c654a1a4d132d034d1043aa17e1cec685fc766788e9f8c43878d8ecef357bd84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=gameloop+download+for+windows+10+pro PDF link annotation
    • http://firegallery.ru/img/upload/43209773145.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/43847b698edac109a42746aafb1d3943/pubelosoga.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a88ead1c50d---94249086695.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c61dc3d36fb---19829373820.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a47e942ca2c---ronewizanodamepezebepoz.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/vepamoxefodilosidadafeju.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/fef1ddbcf4d57e234e4209b21b1bea00/lelarak.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0ba2ab02a---xuxebeki.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b89e7ba652b---giligo.pdfIn PDF document text
    • http://contelex.it/userfiles/files/42296300756.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784a458aabf---sonox.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/a24a6f979a36d4aa72c883203f16df80/fumozojivemex.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d15cf12d7a---modiwiviruf.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082d7f8d563d---donetupoxigibiw.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/6fc8a59c4010bbd55b99b7fff8d9e7f6/43687864158.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/32c04ef3ef4427762978c8cef0667d92/rimarigixidusubaje.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/23883612013.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/fdd6588b4b64896bebb9e18241b19a7d/31927617095.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160872956582d4---59989854280.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a35ab9781---40195501811.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///guwinoperigonazugewo.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/bf22a47df40bda0689180499a69968a2/82261797936.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/49100309826.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dac6198e48---nitopu.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/a2d3f433857a25b1ff67103121beef68/sewewarufuvozebose.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_off0000f3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CA 10860 bytes
SHA-256: ab7fd61c500349984a2efb403bb9955082ed4fb19b6b02087ebaeaf74aa5a52a
font_01_sfnt_off00010ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE7 16688 bytes
SHA-256: 2a444f8f8ae2ac5349f9503496423c4c9f205b39c6d4428ac2d41b9448a55fee
font_02_sfnt_off00013855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1