Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afedba03a50179c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 14:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fec92736f348e32d614cfa3319ba079c SHA-1: 49dfa54b0d777243dec35b8bf316ab72858f56c2 SHA-256: 7afedba03a50179c22ecfbcf98912235bf4a708fa3108e6cdcd936422666eeb9
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 uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://surtek.biz/image/files/20150319_045501.pdf In PDF document text
    • https://zoldlepes.hu/userfiles/file/50292214137.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/79701134678.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/fofutajasowanoruximopu.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161322fe7043d2---43057725589.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/wozageweziro.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/13489714670.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/51190918726.pdfIn PDF document text
    • http://knipia.com/userfiles/file/24453549774.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/nalekemu.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/8naqn8kmq6j4fpson1d5pob9e9/78822280488.pdfIn PDF document text
    • https://norservis.com/files/files/61732409481.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/xodipojekudogi.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/lobepawamekolazojubekif.pdfIn PDF document text
    • https://paradigma.bg/uf/file/pomixiseliwimat.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/31984525697.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161368eba596cb---xobofekero.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b4bc56735bfdb79842b97138c1b00d3/xuvojokonapareragegu.pdfIn PDF document text
    • http://cabini.it/userfiles/files/kerowarozivugeweriwanop.pdfIn PDF document text
    • https://nls.vn/upload/files/10360588314.pdfIn PDF document text
    • http://cartopack.be/Images/file/suferuneravebobaza.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/16731874329.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/rezifizumirefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fnaf+2+free+roamPDF 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_off0000d2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABC 22772 bytes
SHA-256: bf0dcde302a12b1ba43608a4c93668867b7409f2c2d31a71dad04ea4a4826b15
font_02_sfnt_off00012649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12649 10068 bytes
SHA-256: d68e6a89dcde15976458e18515c9790a091e4196f3250741fa563e047e396ce0