Malicious PDF — malware analysis report

Static analysis result for SHA-256 27643f15f387337e…

MALICIOUS

PDF

84.7 KB Created: 2021-06-27 09:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f24be0a7ade81720927eaa5d155d73e5 SHA-1: 0a06920ecc6921509f176de65e96a71064e98bd5 SHA-256: 27643f15f387337e37b17190a8b12d8dd85cfa02c9e5866e298f6175a94fdeb1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of multiple unknown URLs on potentially disposable hosting supports a malicious campaign.

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://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6a2281a32---ruvakedix.pdf In PDF document text
    • http://119hero.kr/userData/board/file/nubalikobomofodaba.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/ea56ad146f18edf7202c1a4733acce55/18909087344.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e28daa52c---nemelinodarexofil.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607875e39aef4---wuramafokajulikuseta.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae47d134e2a---limoxugaxejidulefa.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/mutowufutoleta.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/8tt1odk5jelhsbd720ot0oel83/66496285360.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789f008cd45---buberuramifuzikavogeze.pdfIn PDF document text
    • http://usmleworkout.com/files/file/wolidetinudinojaxutura.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/8624303106.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/4a6e1ee3305c0f571ec6da6937a4a8ab/tebakevoxidetavolezenewuk.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5439534a76---fudukatijezozisasitirili.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/46227067421.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/vovigarumunojetuzolovo.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/64543675962.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210601_034300.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/444unvodsdjsa4tf01gnerainf/fuxobu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a085986a919---52709132626.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/ef93d062cfada24467c360cc94c286f7/78280047277.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/xiziraromo.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b58f07060---tuxukojogisezirodomej.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/wusog.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/d31c4403620b5d237b23870beab1540b/16987034478.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/9727q5s0pevococj5hlrvra7o4/9186793034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+young+elitesPDF 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_off0000e88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 10304 bytes
SHA-256: 0010c94548122a110240e4da13cc63ddcd72d871e00abdc7ae1554e81465a8eb
font_01_sfnt_off0000ffbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CF 17136 bytes
SHA-256: 3e984468f07dfa29bc3e2bb4bdd58c9ee3e57d3c688a300a13a8fba9e9926945