Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9b248e4afb183a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 08:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cdf96e69fd1ebc9bcc7b45ca33f2de06 SHA-1: 9314a2887188cc6fc4893814680d4b404da280f8 SHA-256: fa9b248e4afb183a4d6584133a9d817c3e71c32d2ea0d86fb8490543d349d3b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/380e5452adee3e481d26c422e4ecb956/77768531020.pdf In PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/katisasevogav.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/mugusatomibegobesoki.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/jomilodugimerodaxexazuje.pdfIn PDF document text
    • http://superazs.ru/images/news/file/sekotatogusajifoxuto.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/22813403286.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/xerolagerebapojebal.pdfIn PDF document text
    • http://schokobrunnen.com/idata/54590147508.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/p2b866jc2elea7apmsm2oj4n36/ferobixukejog.pdfIn PDF document text
    • http://rrarental.org/upload/file/91485853512.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/bovezewogopumo.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/gepuxamowurilipexiris.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/96138053566.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/54150369536.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613787904bbc3---zemuxumalejutotoxetufexo.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/427198ceef141b27896decdd66e055bb/rerokabojupawefi.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/sejotuxotikezojutogadix.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/felunetowet.pdfIn PDF document text
    • https://mimpishio.com/contents/files/23814625487.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613842eeca10e---63064174015.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/15167631799.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/58667268444.pdfIn PDF document text
    • https://wsbtitan.com/images/file/xoxabasidiveviwisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=wifi+manager+app+androidPDF 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_off0000dc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 10524 bytes
SHA-256: 1acf5e67268f61f642d8f387efecf50770ea96c61c4ae80a264a0218b4200897
font_01_sfnt_off0000f3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 17436 bytes
SHA-256: 15fc8734a0ac85c3347eff2eddb27d0d89e5af6b13b66e872c66ae26ee974998

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