Malicious PDF — malware analysis report

Static analysis result for SHA-256 9998159e2bfd5c1d…

MALICIOUS

PDF

77.9 KB Created: 2021-09-11 01:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8f5a5059acdffbc6745d8300df8fa4a7 SHA-1: 0e37eaab9f1f0390ecdee37485ba2ded013728ee SHA-256: 9998159e2bfd5c1d1eb8485d2e4edce02175254bd0ee3bd389f88a8536647a9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ciela13.leaddeehub.com/userfiles/files/19879044532.pdf In PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/78177262874.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/b1ph7r03lff9l9hbmuov1m4r0n/wozebegasag.pdfIn PDF document text
    • http://mfahk.com/upload/files/77935165178.pdfIn PDF document text
    • http://aquatherm-graz.at/files/59235539065.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/nofijokexedodepaju.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/97556507999.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/632640806613af6b5c1078.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/85892575097.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/votisuxuge.pdfIn PDF document text
    • https://ratodua.com/contents/files/68582813530.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/nepurux.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/14014058495.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613618a5d7a81---52680313221.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/zopafagunatirigepolanufu.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/64467967381.pdfIn PDF document text
    • https://signika.pl/Upload/file/71913392387.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5b6817df4daa2a92b61c50f28444a9ce/48221745885.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/12356910219.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/79431324852.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161361214385eb---98772502157.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/sg7fqdcoq49qcup282uqttoabd/ludoto.pdfIn PDF document text
    • https://coevent.ru/upload/files/daram.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+transfer+contacts+from+icloud+to+samsungPDF 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_off0000c799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC799 10996 bytes
SHA-256: 91e337be4a96d968e1e81bc8c031e00a8862e476af115920710d0855c751edfc
font_01_sfnt_off0000e0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EA 18712 bytes
SHA-256: 4bf09b1ad0c1d34a5d75636da8d955a3567c10f190de71e3c57b57d3f21a162f
font_02_sfnt_off0001112a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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