Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1f565c5e834f9f…

MALICIOUS

PDF

78.3 KB Created: 2021-09-04 23:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 944ee6ba1289690ee02310b1d9b929bd SHA-1: 09da1bbf71a1614ff2b7f93fa0018da22e48c709 SHA-256: fe1f565c5e834f9fad04b04b6e19372fd79d7b49e69c4fdc5f943e04300c054d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure itself does not contain readable content, but the embedded URLs are the primary indicators of its malicious function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://cosmoscm.com/contents//files/94513621675.pdf In PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/152068456660a11c6c1407e.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609290be0c2ea---49243871852.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/46282715389.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/zilenodesefivaruka.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/lokunew.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/jirepanajuxogofaze.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/57139595377.pdfIn PDF document text
    • https://kaparatt.com/images/File/vejosuxadegiradizokusor.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210820135435.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ndl978qcscrn5kpec0a6muf5lb/lemanonijupadiw.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/c1k73fpb5kfl8eusae6r02pp39/wodovorejajoj.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/1324db42e4f999885564291d8acb2482/49164392252.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/55886770341.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/mevizoweguxinufulumirasa.pdfIn PDF document text
    • http://abc-tel.ru/data/File/88025160070.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/poxogopokakivomadope.pdfIn PDF document text
    • https://invest.pl/userfiles/file/kunajufeneduk.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/48798037344.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092339a73d9a---nulobub.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c084ea8abbc---59935279131.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/l12nsblmtgb1oitvhvqm8mtkf1/90543823231.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/39412336332.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210725152834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=math+expressions+grade+1+homework+and+remembering+answer+key+pdfPDF 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_off0000cdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC2 11476 bytes
SHA-256: 2bd2bd5cc34ee66bdc280a4bd29b86bf44a3fe919ee0edef607d26d44c7c07d4
font_01_sfnt_off0000e873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10085 16416 bytes
SHA-256: 6513d71833916adc522ce4f0b0a89b7924cb6461e4a1492eef0ec69c67fc478c

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