Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53a117c28441121…

MALICIOUS

PDF

85.2 KB Created: 2021-07-21 11:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20d24c322dd970d009b220e516db0ddc SHA-1: 7ec623890547ef81fbe948569c498f695da0cb03 SHA-256: a53a117c28441121f7f05acdeb64e454dd5c1f20541ad856b1e76a34743f0feb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of multiple distinct hosts and a high number of PDF links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6a4630890---93501147402.pdf In PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/jojopowijalitesido.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/22717331518.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/88731534493.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/bamepapivelolasateveg.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/5315dcce1e60e53f4984cefa2ce3a23c/87609619690.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac31bf4a979---98093374516.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607781d645b6b---14895285270.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/90873690042.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/nc45hahdk2hggfd07fcci7rnbv/kevukelabetorawobex.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/ruvutusigewa.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608224f13d66b---figesejoderejadigabed.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/nifuwetifukaxemipepon.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s8dg5opeoi5jvaokdk6o9baba5/tidavepipovejaporapu.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/31964536325.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/dmi49m5lj1d813k81uiftq3t8j/63119797422.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdffd7727f---gujamanazuxejus.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/47005687788.pdfIn PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/36147749323.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/28812407041.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/1oel05gcgc3ee2t01kt5fjbbp8/viximagawufe.pdfIn PDF document text
    • http://o2ashop.com/ckfinder/userfiles/files/15433411826.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/zozavesovonaximuxitilaf.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/pobas.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/paturalorezuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=show+me+cape+canaveralPDF 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_off0000eb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 10508 bytes
SHA-256: 7e9a6681b3d029fd0aa707dad6843707c6d0961a23b7ca7019e6dd7f853491f2
font_01_sfnt_off00010349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5B 17084 bytes
SHA-256: baa335c85d54ef52c4bc0271ea0c7c52920a148d305eb0c980ceff8dcbc5d18d