Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3da973d41e3c25…

MALICIOUS

PDF

74.5 KB Created: 2021-09-15 17:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e2e33659f38d633ae1216b15e73df502 SHA-1: 2f1ad1856deacfd54b910486885fa307ac59cb33 SHA-256: eb3da973d41e3c25081140db8bc3d361004866c92a8fc44494f75ce725ede339
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to disposable hosting and compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The PDF structure and embedded content are consistent with a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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=pdf+editor+premium+mod+apk PDF link annotation
    • https://unitjaya.com/contents/files/95706719378.pdfIn PDF document text
    • https://airxps.com/userfiles/files/dilozutonevemefuzane.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/robazatunogozakorazepuriw.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/nagisesopotolavexodixofuf.pdfIn PDF document text
    • http://drtamerturan.com/file/25318423217.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/votekeder.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/vinisesajovefeb.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/11420597655.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/56163659944.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/sijaguz.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/m29ojn6tmvfii22fcl9f0dhr83/65276057713.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef7a95fa89---57060196950.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/10445677671.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/88152032345.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/9415009957.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109021253564689.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/62560374461401c8b1c06b.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/riwexarisutepevewaluxol.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/11614970674.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/supujonaxotitatix.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/zudovuxo.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/28566418456.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ebfba6c2c920840eb5ab4d2465b7cce/jijikudatezabuwezilipi.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/45284043539.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_off0000bf21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF21 17272 bytes
SHA-256: 9fe40e952f26eb5194c0c4227188efe080a0f80cd48d2572cce7866287c83dd1
font_01_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 10532 bytes
SHA-256: 26d29800e8a4dfa0a91c81f4f17cc9b2ea931b37feae57ce7d2c64046223a510