Malicious PDF — malware analysis report

Static analysis result for SHA-256 409e45bb02fd25c3…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 19:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be0192d1c81203cbb35d6c8f793cf827 SHA-1: 9b60d8d16a1ef875163ba745b8e5a8818d419828 SHA-256: 409e45bb02fd25c3c6097afa37133cdb081e5f3cf6b7a64347fade34d64a3353
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the presence of numerous URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=ibps+clerk+previous+year+question+paper+2018+pdf PDF link annotation
    • http://bjjiffy.com/upload/41673707719.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/pdm4lhoqj4g9pbjqc93g7v51os/wusup.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f57342d493b---dujuvo.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/90924519637.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5f08dea4a9---98441228366.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/guffpddlfha3cgf440n5p31pu5/82966323771.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b77fdbbc3d652a07790deebe2a7fe706/99356677224.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021083109022270.pdfIn PDF document text
    • http://allasclub.com/campannas/file/37966360880.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/48225312297.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/48925305.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name//files/liromulu.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/24900748430.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/nunuberoxawibiresako.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/niwoxovigaxadajin.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/59934502689.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/50b824b61f3e501bdf6856c253136f74/batowarizabafimuxiseb.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3813698171.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16121cfb9ded97---sejamoza.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160dba2759d3ff---21984235376.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/18623521185.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/poletuwofigo.pdfIn PDF document text
    • https://aedwea.com/upload/foto/vanagopajafijopewasox.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/37982861265.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_off0000cd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD10 21004 bytes
SHA-256: ad8d5c609d22014d3aafc8e081f14111a58bc1ce83da69a8c573d53500d2c346
font_01_sfnt_off0001049a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049A 11724 bytes
SHA-256: 6e33873ca48f3ea13f70187549fafafc8e7e6a3e888d1f8cb965b095217610a9
font_02_sfnt_off00012066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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