Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27816c5f836d4cd…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 08:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b73eb9b39305d823defa6d2e883c5685 SHA-1: 18c8440709d7110f3410ff2be7773f671ed458ec SHA-256: b27816c5f836d4cde7bf3919bd34daf2138bfbe5f0c1754d3216507b760582c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm designed to obscure the true destination. The embedded JavaScript, though not fully analyzed due to potential obfuscation, is a common vector for further exploitation. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • 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 http://naturalwonders.com/uploads/files/piruli.pdf In PDF document text
    • http://jandenzobv.com/image_uploads/file/79153692125.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/jutux.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/14737303891.pdfIn PDF document text
    • http://palcev.ru/userfiles/file/vimif.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/58145145927.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/xololax.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/53895433626.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/68928723246.pdfIn PDF document text
    • http://renknh.com/ckupload/files/mutokibidajume.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/lv4hh0vaskqi1v1c3tg4ju445j/62358186867.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/42015116248.pdfIn PDF document text
    • http://seritour.com/rsm/files/govalev.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/kobagox.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/jobexalikonuwedarixiw.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/97716284458.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304862eb3bd---2973762146.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/divaloralokuki.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/gusigodasagukuwure.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/30113655363.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/35235278489.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/waxobesapido.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/20805165024.pdfIn PDF document text
    • https://synersys.fr/contenu/file/87514748942.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/wufapozopukizalanipur.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161356ef91c872---gidanuvogitubudeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=metal+plate+unturnedPDF 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_off0000d8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D7 17708 bytes
SHA-256: 25d3e2e861028a75d9842e786e68da03c9c02e6367a38f335e10954868bc3790
font_01_sfnt_off00010668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7F 10100 bytes
SHA-256: 687ec8c6caf99b64bdce5ccdfb7eeb256c273a6063dabf8668048881f56cc61f

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