Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f1bb15af40790f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 20:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3ff0ee3a45e0e172617ebdaa058d63c SHA-1: 97a01bedc28acffb8a2c8a6d9b8595706dbc346c SHA-256: 70f1bb15af40790f92b3886be9f5991a2aea045bf8e3eafbaa4395e1bf78bec5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://cl-metalparts.com/d/files/21559797499.pdf In PDF document text
    • https://aldapa.eus/files/galeria/files/28487416512.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f65f9eb4c5e---55836740934.pdfIn PDF document text
    • https://protrialse.eu/files/files/70375105470.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/12239648759.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/19373814712.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f7a926b661c2304e64c0362c852d8a4e/72197419829.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/morovenosujadagadexus.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210728/file/gofederutasifedute.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/194472585.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/52431298173.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/bazoregimipokej.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/71222480211.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/0ee49aba5caebfee5eb5bb1185b6b49d/67757646168.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/f738fb6c552c3499e01f9cfdf8ec502f/vogalavorozaniwilimevad.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/natovuje.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/fawupixak.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c23b918288f---kojigeboxotojolifus.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607172e7f262a---ruzijekuwasugerowuxugug.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160760dbb61053---69421091157.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1c9227b89cbe3205b5573100c637bc1d/rujizi.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87f7bbdca5---7252221029.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/virevolidofefeladofozem.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9c9bc6bd1---77767429575.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f8437c85f---6181564434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=oculo+manual+oculo+pedalPDF 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_off0000d7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 17400 bytes
SHA-256: 39d3e0b107c23af3c6c57a1695f142dd8907c3f5cce9cb0a101143ba56b087b5
font_02_sfnt_off00011b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B57 10340 bytes
SHA-256: bd418afd1b314ae26a77702878b7ceaac892110c983e09b05a6024d6aabc222c

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