Malicious PDF — malware analysis report

Static analysis result for SHA-256 29633c6152cc6a99…

MALICIOUS

PDF

78.4 KB Created: 2021-09-07 07:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cbbad347f80b15d79c608a853c515b65 SHA-1: 85c7a81b982d93b57d9cab406e2e5d315135bfd5 SHA-256: 29633c6152cc6a998af45c8c2bf956743a11b00181b83bea9326ee58427fb372
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to various websites, many of which are associated with link farms and compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=directv+remote+rc64+manual PDF link annotation
    • http://fxmeat.com/upload/file/7d5dd6e368d846b6bce3711f65d7e76d.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090bbb477c58---gipefegibenezududepawi.pdfIn PDF document text
    • http://prestopc.it/upload/file/tikowatufo.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109050051159840.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/56027046370.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/81403117121.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609427184eb90---61552412172.pdfIn PDF document text
    • http://praguetransfer.com/files/file/duxubajavimipizinidilixo.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/67335293817.pdfIn PDF document text
    • https://ancoraeducacion.com/images/digodijozoperimomep.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/dawajegidawapunil.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/81899752395.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/00d7d34813bb862180c7694fff0cbb23/64927220830.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d262a42961---resiloronemuxa.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/60df42d4948829bba866939748cac27b/27428404027.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/natore.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608af8419e0fd---roguzoruniba.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/56345034472.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16089eb6918765---vudisipotiwisatas.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/48757536579.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/83238518600.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/7557302810.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_off0000cb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 18688 bytes
SHA-256: 956833e01aa3d443bfa9061eb0b3f8f42dd086ebe2f5db04159af24675039d0a
font_02_sfnt_off000113bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BF 10636 bytes
SHA-256: d359b46398d90292a084074b14b749a9020c94559870c855beb79d937a0ba5fd

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