Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbeddf6de6abf38f…

MALICIOUS

PDF

75.6 KB Created: 2021-09-13 03:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6fab3d9d542f0e43fcb9cfea449c9223 SHA-1: a4e61784fac2d572e2156e7985bbd1cadec9f4b9 SHA-256: dbeddf6de6abf38f3871702edd3e9f3422730c61a781c86cd45b441be2884475
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tostonet.cl/ckfinder/userfiles/files/73268342467.pdf In PDF document text
    • https://landtop.com/filespath/files/20210909181200.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396acead1ad---89852061645.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/96997195267.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/38377868742.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/tobude.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/fosubosisokebulutibatuj.pdfIn PDF document text
    • https://renewone.de/files/4667807460.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ddda00bca---55409333087.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/99973994826.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/10467142708.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316aeeb87eb---pulinizemuruni.pdfIn PDF document text
    • http://fxlcd.com/upload/file/81307315953.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/lanuda.pdfIn PDF document text
    • http://salkim.com/userfiles/file/29548550151.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/35547980822.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109012134391816.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe7491ca0---79004458365.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/70633676750.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/komumur.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/33969085849.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/86672748539.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/91442721566.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/zenekugoxivano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=nxb+ninja+tribes+apkPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/79323060907.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_off0000c3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AF 17108 bytes
SHA-256: cdf0905eca3315a303507629c23b25decd8449278facd4c02e40595af997359e
font_01_sfnt_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 10520 bytes
SHA-256: ad592c0ec24077ae894aaa3c11e20678741d0ccd7b1875a8279b8f6ff5dc61b5
font_02_sfnt_off0001071b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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