Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8245d2e91a7770a…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 04:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 30205d5ec6afc9f39617fa12f23353b2 SHA-1: fb2d1785fc9d1062f34c7ef60eea7cfe5267e9dc SHA-256: c8245d2e91a7770a46877f7202c9526c60670fc45bc188c10ceef2da978d40db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=omegle+webcam+online PDF link annotation
    • https://kotypsy.pl/ckfinder/userfiles/files/3920675097.pdfIn PDF document text
    • https://plasy.com/uploads/file/joganifu.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/48999551892.pdfIn PDF document text
    • http://flomojapan.com/upload/files/21150937968.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/duriwejalinutuxivide.pdfIn PDF document text
    • http://poultech.net/d/files/wimesedowut.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/dijej.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/56503241285.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/loworovutanixobebu.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/jenubiw.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/73333488241.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/53851506750.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2d07b068e---xojepukexitisakozudu.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/fodoriwufategatukobix.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/5010516430.pdfIn PDF document text
    • http://phanbonvino.com/media/ftp/file/xijejosoverexidufabu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/39a18eg7jr38hvnee1lg3rlv77/godixefizuninipi.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/1930344052.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/7492109669.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/92857a4a1c280948c01343ce9e171a84/52828535053.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/rezagu.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/aa2e9387d5b77b53e365ce525be6f6d4/pogila.pdfIn PDF document text
    • http://keyday.ru/files/files/dowoxuxezapuzogelefawak.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/tuvavibepibarekujoduno.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_off0000b26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA86 10460 bytes
SHA-256: 1161757c7ba985af79b36681a5a914978574115952131112d19751b93b283d1e
font_02_sfnt_off0000e249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE249 16000 bytes
SHA-256: 7a66c83cab01ca77c4567391874725d9c3efa6bd914cb573ec2015681f6b51aa