Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2baa77ede079c8…

MALICIOUS

PDF

79.6 KB Created: 2021-09-15 11:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c4426310a29f0344309002777c5283d0 SHA-1: 2b6d018a410ece28616d2b9ee13bb577d079adee SHA-256: aa2baa77ede079c8d46676db58a2e06437407c0ebb0632fea7a7b8b04c135c6e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scans. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=open+wmv+on+android PDF link annotation
    • http://xn--hh0b97d8is16e.com/userData/board/file/memakujasulusotebamepinem.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/kutimoxaluxedajole.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e84be0c774---33248070271.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/wimerigoxamagalewekilejo.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/tikametomugav.pdfIn PDF document text
    • http://pasted-radio.de/web/files/47281308819.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/pusopixetozat.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/80389681974.pdfIn PDF document text
    • http://robbes.nl/media/files/nebabaxodub.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/83369383701.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/94472127998.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad55eab354---77971920128.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/36037524357.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/wogawoxora.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/ziwijuwesetofapi.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/fevanarujuwezumapofog.pdfIn PDF document text
    • http://smirna.pl/files/file/waxejamixegiseze.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613835bc8b7e4---xuxubonazewawefogazadeje.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/45709803670.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/nolaz.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/92078213007.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/d87803494d73fc3946b9d50f687259d3/74258993589.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/39778206068.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/62447158214.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_off0000d16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16E 10420 bytes
SHA-256: 7150fcdb01f9dd4063faf51c8fbaaa7a5b51042ff82abd52562b856e9c62c109
font_01_sfnt_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 18220 bytes
SHA-256: 81cf811277618dbaa5a131af0fde2aaf8750e85e893ff0b23cbbb229e4cdf27f

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