Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd781423c48dafc4…

MALICIOUS

PDF

79.2 KB Created: 2021-09-09 07:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 729e6098b7eb0ef1ea548330eac78525 SHA-1: fd8cd18deae7639b0a9e57fe423f80ff7ccc33fa SHA-256: fd781423c48dafc42f2657eef268c895e08af2fd93a8cd66147ad04843c899e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=carp+fishing+simulator+apk+download PDF link annotation
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/lonuvenagirar.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613062eb243fe---53366248016.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/figofirilewatabefuwatenu.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/fawaxizafomor.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/hfssh48i0h224uolk7j3mlubm6/nemupixetozili.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/39632084148.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/68739152164.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f146c263fc---7823546109.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/70046332522.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/28699889660.pdfIn PDF document text
    • https://conrays.ru/f/data/xumavoxesenawinixowape.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/65309142841.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/rimadozufitudenoku.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/pujilu.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/nopigajo.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/xupaserimiwofafim.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/sumumazodu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/fesetesawububaz.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/sekutejiva.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/joxonapavowelutaxi.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/nimenikuwevima.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/lipoj.pdfIn PDF document text
    • http://tecksco.com/upload/files/disotajaxizuri.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab50f42b8f18eda3b415cb33dec68044/solerowafigozanemipotope.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a6cae43fb03dbf3533d0f478cd9a7df2/solusakosemujaru.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/fodudijenaterap.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090945518_120664922.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_off0000ce80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE80 17524 bytes
SHA-256: 6864a389c0966b1a876bf36b85d1f084476e82b1f79a1e1519f5c0b1661d65b8
font_01_sfnt_off0000fca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA8 11124 bytes
SHA-256: 823fb4fd21c3f187b25847d76cacadceb8d776308d4c0c4edbf22b15448b9059
font_02_sfnt_off00011644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1