Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b285ac7058ab48…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 07:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4c776c014e3885e8d2cfe695dd48725 SHA-1: 9da4657fcc7a875dca67b127ff97a0569f28fab5 SHA-256: e4b285ac7058ab486c4c85eaa4ac69cbf56e1d15c3f0e71514f00f927c800e0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that point to various PDF files hosted on potentially compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'PDF_URI' heuristic suggest an intent to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://catamma.ru/uplcv?utm_term=essentials+of+strength+training+and+conditioning+book+pdf PDF link annotation
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/zujegekosit.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161427d96ce0b1---86639442783.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/pivugujujeguwezopemiki.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0535a2b4523e819b70d026c50f16790c/20739982522.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/gh6ehdvs0cka15ehogmu355ggo/jewolegojoto.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/lidebakedejulev.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/34431105112.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/foxelogokagagavonavo.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/81590611130.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/82848819626.pdfIn PDF document text
    • https://businesslife.com/content/file/72304122244.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/88307746214.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/20478635245.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/97559304143.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/zigimowovevugegikevubezeg.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/murigadolesezav.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/41403341257.pdfIn PDF document text
    • https://megashina24.ru/files/files/61635672228.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/rizadoxom.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/fbe422f623fd426d0d731c881f0d89f4/worololam.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/q2tj6lqmg67291en85u4eojftb/siganunedetinidomivav.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/nalezizofagusesopomemerom.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/wozarapowinirakupubet.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/48549531752.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_off0000da17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 17212 bytes
SHA-256: edf520df53fdc3dd1c0bd220dba1be50b3333873b11bb064a32a8cf25afd1bc6
font_01_sfnt_off000106cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE6 11116 bytes
SHA-256: 41606f4703786f8509d39f697b154dbdddc1b61d60878c74cb386c1ac54158f2

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