Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd998ccc675e6610…

MALICIOUS

PDF

73.3 KB Created: 2021-09-11 03:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 81c0e29d46b9ff0b83643448fd63a697 SHA-1: 265390d84e4a8894b5c2b7f2f6d7495bebe5bb38 SHA-256: dd998ccc675e6610d210aac20b635dc52fe574bb91ae283300b6a6faff38fe76
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 https://crysiq.ru/uplcv?utm_term=meliodas+live+wallpaper+download PDF link annotation
    • http://recviem.ru/img/upload/72529374208.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161315bd9e1244---56712076250.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/95886950487.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/reraxapudixuzalufedepaga.pdfIn PDF document text
    • http://mopron.ru/upload/files/52203836002.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/lekugobiwobemovopavewaros.pdfIn PDF document text
    • http://termocity.by/pics/files/43940470580.pdfIn PDF document text
    • http://hmed.vn/upload/files/rixepup.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/kolalezaledufabivikar.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161360dbd7c259---81661840964.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/rivazoxogufudive.pdfIn PDF document text
    • https://cecprint.com/images/file/82273268747.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/25077692550.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b457d39eb9---mejonudaxavexubepurux.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/15274788149.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///202191104223587.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/28800995764.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/gizafimebebewid.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/zowegadufesutimati.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/dolonox.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/lutetofokawizujesijuw.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/1631176602568.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/kojubegufo.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/babagoje.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/rurug.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/fuzojifami.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_off0000bcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDF 16476 bytes
SHA-256: 8dc7584126b56f7adf141526b7394911c0589f878cd6c6d0aa7ae14df5a1707e
font_01_sfnt_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 10432 bytes
SHA-256: d51cd70afee7fb72bf32a9c1e22cc9e65581da0d0412274646736f504cd9ae28
font_02_sfnt_off0000fefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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