Malicious PDF — malware analysis report

Static analysis result for SHA-256 392c49d092b612d4…

MALICIOUS

PDF

93.3 KB Created: 2021-09-18 17:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1069521edbcd86763a8faae3bcfcdb9f SHA-1: 115dbbcab9cd671914eee3b52bc0b02863442e11 SHA-256: 392c49d092b612d4be6442e4cc89c4e5dbac9d4efd9ae47128c43722c73c2383
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://autoroman-service.ro/imagini_ws/kopajaxenimoduwamob.pdf In PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/20040243851.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/8349071312.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/71756797383.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090906224148.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/9cd434c7b4be46bd6edf9fb7e5df4f72/rixilatamoberafutanenoxo.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/kejojudojusoxalod.pdfIn PDF document text
    • https://anesaportugal.org/upload/file/lurixemoragolajitugamifig.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/94818239165.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/sejimozopid.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/78315685253.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ruk936a88mn17d73coh9hdbmf3/bazuwobipezulo.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/dimigoleponabumakekoka.pdfIn PDF document text
    • https://jin-ji.com/upload/files/47451943569.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/21261229542.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c9d108bce---21982407746.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/84698012932.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/pufelamozupi.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/66389136326.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/64636913427.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/99660917012.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/56581997600.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161397ebfc4c18---letukafodepizaxexajekixil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+simulation+games+android+offlinePDF link annotation
    • 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_off0001079d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAF 18340 bytes
SHA-256: 04083a1d2780d475fbc9ac451c78090e3556b42183c21f98623b7bc8b4dc5287
font_02_sfnt_off00014edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDB 10848 bytes
SHA-256: 2d6b0a4068baa6e226d711fa129771a7f73505851f7aa315f4a7469336871fa0

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