Malicious PDF — malware analysis report

Static analysis result for SHA-256 06f00997a388f7aa…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 11:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bc1af3f1fe126fe03945f11fbb515e04 SHA-1: 0ee6081d912143fa797844c9cfa86c4c2d54654c SHA-256: 06f00997a388f7aa6b2aef0003bc6b79f7d8d257fb84402ddc7f37e2ae34b923
196 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 CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may also instruct users to open a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://estoniapools.com/contents/files/dufubejukatixet.pdf In PDF document text
    • http://www.anaja-inter.org/public/file/befiteraxidikosenudi.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/gebibuzix.pdfIn PDF document text
    • http://synergyproperty.com/images/files/midixifibuw.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/forefupemobuwobavojinu.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/relopeveratikufabewa.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/31304828377.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/61446814582.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/vusaludetevenulefit.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418687e1232---9388810785.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/lenomazur.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210906065953.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210911_73EAD1BED05FABCA.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/suxijofirerisom.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/muzipenovaburenofu.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/xolopasamuvodafeso.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/78974988985.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/31109627648.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mbr7mg5rahr9sb58jmp8kprl14/nibukokepulizovik.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/60227273197.pdfIn PDF document text
    • https://fishboat.hr/files/junalojuzu.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/debev.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c6d25b76a0bba27a8ee91004d9669ddb/5901031005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=uc+pubg+free+hackPDF 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_off0000d8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 10472 bytes
SHA-256: 21c20d4fff9f849b74d70c5a4d3b7b0f21c348683cd08f145d45e43106964572
font_02_sfnt_off0001089b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089B 17168 bytes
SHA-256: e7d302d3b2631295e9ca2b522ec8806769ddcc4f65ba60747916368a28c16c46

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