Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3ef890016e47b9…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 17:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c433f8dcba391f1a43ddb1b7808f3d4 SHA-1: b3996f4ef5644d3a25b7076576467a8ab1a98793 SHA-256: ba3ef890016e47b91c8f097abc5252b1027cecdd9accbbfac362a0cc102365bc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are typical of malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=droit+communautaire+economique+africain+pdf PDF link annotation
    • http://nppmaudaha.in/ckfinder/userfiles/files/41208251058.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be10b6216a---gixorepenidozalisomubaf.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/juwofemirawoguxol.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96303888235.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/25027206470.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/tadotipa.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/livezinunezuvebejasodivit.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/zotasewetejiwuza.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/cnhbo28nf65djc62brrl161bnd/58712889077.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/25999284828.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/perazotigemunasanikew.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/momasisopirigebikozepavig.pdfIn PDF document text
    • http://teifsepahan.com/files/file/pabopawijijojiwifeb.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/65539292360.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/10604830910.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/84051170522.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/dinizeduxuka.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e31d53ad---54959326892.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b97c1200969---kodurunixitogi.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/1211709366.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/gusix.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/1al333fsrdbuunp0gh2bo6musm/38136335532.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1838d944c---28993535375.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_off0000dddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 19224 bytes
SHA-256: 88b9688a1d805a14b4ae6fb1e939311ad7728bf4afcb8b37fa7f69cd2b1fe762
font_02_sfnt_off000126a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A1 10812 bytes
SHA-256: ede3b8b1e29a212c789e27e5f173eb906c25a139d3bf42d26cea2567f42d9701

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