Malicious PDF — malware analysis report

Static analysis result for SHA-256 a283aec261e1d457…

MALICIOUS

PDF

77.0 KB Created: 2021-09-18 02:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6a3721db11d375144e98ecd59f7ddf01 SHA-1: af4cfc6c279edeac31922f0ed3ac52f39b9d1599 SHA-256: a283aec261e1d457185f8a8f629016e25a7441ef4faf1db9a49e448177d8dcf9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=talk+chat+mod+apk PDF link annotation
    • http://wwpokebar.com/uploads/files/jikusupurawedisimofop.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/ritagekoxegumot.pdfIn PDF document text
    • http://www.toptehnik.si/images/rewibefaneji.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/ramorutupaki.pdfIn PDF document text
    • http://levotst.com/uploads/files/83075748296.pdfIn PDF document text
    • http://recviem.ru/img/upload/sexiwaxobobawiwolukewi.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/90492739202.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/kuxesadabapifel.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/divaduzikulimenubulib.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/4656430012.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/bidaxafidi.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/424ece10a9920ce435d5419d813fdcbc/46795890463.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/xoruridibo.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/xexijiva.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/4b537516972d9fd3a1964605c949a197/53599300166.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210905174746.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/15390829915.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/zamuvoviturazidokupumovi.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/62389973787.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/86875622239.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/28614379705.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/gubewigunarokagexebo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffd324889c---wuwitojuverut.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_off0000c857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC857 18440 bytes
SHA-256: bdd2899b1a526efaed95a6ca9858556167d9894b2f92eee5af7131f537262ee1
font_01_sfnt_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11017 10236 bytes
SHA-256: 98465cf3c4672043c62f9fb38ddd0e7b3cc65f8707e6a51d2cdf387d8810aaee

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