Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f61e27017421dc2…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 14:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6160057f275e9b15267f96a4fcc1ece3 SHA-1: fae2802554487946a896b4a85a791e8a7513632a SHA-256: 1f61e27017421dc2984578fc63c2640f9928766285c51e9fdfa963995325d3b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614408231a17b---vunumemumex.pdf In PDF document text
    • http://clairerolo.com/userfiles/file/kizejitinelifaxuxiwuwe.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631102325_30da3c03d2.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614149c7a9a6c---77977652794.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/13745219496.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/99064966196.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/movabutazenoboteja.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f331ede475---konatuterogowukasuxusof.pdfIn PDF document text
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/xegavigizoludedatamaxek.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/fosofimezazaxonasafiwa.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/d609b785c89agtfgncvrbk3qu3/28510296372.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/jumomavatofagifumo.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/5523062787.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/34351630416.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fecf90fbb---1553281924.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/79480379426.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/pagiveli.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109010454453026.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/88356113851.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/kuxagupajowupaxag.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/povevonibunubituruleme.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/55165869060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=reality+play+storePDF 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_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 18844 bytes
SHA-256: 8bfc29f064c8de41bf85bba74484288d8db530d9c45364b3b5471b00ec541f63
font_01_sfnt_off00011ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E4 10300 bytes
SHA-256: 0e0e2f05fbb412a63097671d51479ca9421e7eeb970aa1d6cbe26074b6e8ccd1

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