Malicious PDF — malware analysis report

Static analysis result for SHA-256 228198b5790a8b10…

MALICIOUS

PDF

80.4 KB Created: 2021-09-10 03:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bdfd06444b9c79a12fb9cb1448fe56fb SHA-1: 94c746f261cf129b502b01d0f4d4c9129edc102a SHA-256: 228198b5790a8b109e5b6393b1468dcdced81543f122c785a712d2db9218c49e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://autoservizimensi.it/images/fck/file/pudujo.pdf In PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/99887640144.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/gulazure.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/savegurepepiwixamuwox.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/68580644051.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/41621268874.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/29b8122b3b384c58a7db3c33bcd1560b/35924422772.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/luvekadugizogif.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/pumopozobusonukagesud.pdfIn PDF document text
    • http://opsir.eu/files/file/rodevopalurez.pdfIn PDF document text
    • https://stormester.no/files/file/22438705163.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/zikijagopativer.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/gusizusidurasonikiwese.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/34812506330.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613027c6da79c---80892685281.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/gufokufufafagekajana.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210907_7244B072C7991DE8.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/42652357685.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/vosagiko.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613367456268f---53134673378.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/37469729865.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/63793222385.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/75614126401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=after+we+collided+watch+online+nowPDF 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_off0000d62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 10472 bytes
SHA-256: 5d7088678090ae4c344d6c6658118e37577a89c7285e04624fed813df1bac8ef
font_02_sfnt_off0001060a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060A 17876 bytes
SHA-256: c0c18775363dae32cac42e1c53a9e240d9e0fe0c2e3e5330c7769aa04513f84d