Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3521d45d4c6f53…

MALICIOUS

PDF

85.3 KB Created: 2021-09-07 20:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 84c594fa14791c204ccc05bd510ce503 SHA-1: 99207ffd5aa6db629504f86fe40edfa6fea3c62a SHA-256: 6b3521d45d4c6f5357534cd185fdcd6cccd11234af5e1bda84a11d71250b1ffa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of link farms on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly show the document's purpose as a malicious link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://vvpta-irvine.org/userfiles/file/muwagamevi.pdf In PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/29573787578.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/97707274146.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/14268815218.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c40cd3bae3d---pofida.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-29/20210429133249786664.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/89227768453.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/sudizutivuxedosipetoz.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/fibonavusuke.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rabolojazipaludijixukeka.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984be8106be---lojuzu.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/86312944603.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/ribizo.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202108282243108304.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/89312579435.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/85168298319.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/afd5dba88bac428ec3d291a9984be6cf/42966179433.pdfIn PDF document text
    • http://www.asslar.de/downloads/puwulijuzowowaluxu.pdfIn PDF document text
    • http://atraba-holding.com/userfiles/file/72954240822.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/panemefabamorubigobo.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/27035772527.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/19538381142.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///tijagevopeketa.pdfIn PDF document text
    • http://szpk.hu/_user/file/texapozilafati.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a416381dd8c---nelutekilojopitusewolaj.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/05b16660a2f319e49f3b45a55bb186c1/34831237544.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5082228da8---4795058910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mahatma+gandhi+biodata+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_off0000e85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85A 10632 bytes
SHA-256: d445131aef0828a2dd3394e63552ecf0747f6fd49d66579b93a5894308a288ab
font_01_sfnt_off0000fff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF8 18612 bytes
SHA-256: 149b95b8ae0769b4e1ad23c66a0140242278a94554226ae3746c68a3063a3518
font_02_sfnt_off00012f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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