Malicious PDF — malware analysis report

Static analysis result for SHA-256 45051be39d2dcbc4…

MALICIOUS

PDF

91.0 KB Created: 2021-08-06 16:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 103ba3e05ff3c2e26fbef9e4835ffa93 SHA-1: 61e5350312722060f35d81dab2236bad2e9d5429 SHA-256: 45051be39d2dcbc4cbde12cafb452e9f39144a43f5ca974dc451c5eb9148d0f6
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a credential phishing lure. It impersonates iCloud and directs users to a suspicious URL, 'https://wastran.ru/uplcv?utm_term=icloud+dns+bypass+tool+2019', which is likely a phishing site. The embedded JavaScript stream suggests an attempt to exploit vulnerabilities or further facilitate the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://wastran.ru/uplcv?utm_term=icloud+dns+bypass+tool+2019.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://wastran.ru/uplcv?utm_term=icloud+dns+bypass+tool+2019 PDF link annotation
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/lubujidenovakev.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/241355444339.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/lejemujobenusigeguxopuzuz.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/28362441379.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/83656047930.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086424997d7f---2423125735.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/rtbnem49lh7tkijt3ke16dtt31/tepisavutonadow.pdfIn PDF document text
    • http://afslab.asia/upload/files/rofimupolepibifuwozewa.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ade1d298299---vadozegodi.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/aeu7ff12394faphjuscksvllo4/91552622549.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/rufek.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/21202723825.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/kefajabopesafanojazoz.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c447f9a92a6---pubuveletepupizewolelapo.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/85534621884.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/64782882787.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071f517ef2c0---vavodatumolodujawov.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/71768034215.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608214e4cc539---vekisakasibu.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a27cf3cd4f0---vapeletepit.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/tenixol.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/kuminakulademekexako.pdfIn PDF document text
    • https://kawanmto.com/contents//files/famunij.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_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001169c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169C 17352 bytes
SHA-256: 63a791eff08b3c2764c8ba6d637a1b2230ddb0509d12dddae357fa9a0d4ffba7
font_02_sfnt_off00014406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14406 10948 bytes
SHA-256: b08160c4132d00104ad041b80e6c67569ccfc84c78697a17149782daa274f185

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