Malicious PDF — malware analysis report

Static analysis result for SHA-256 f448ab4f7ff7f168…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 02:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14ca598c6f8e78aa1429ba8e9151e677 SHA-1: 1e2362ee196b1ff2bb784b6e965e38af42ea83f4 SHA-256: f448ab4f7ff7f1686cccfec20b3f9039e8c7c3b160d3f2873896c132609ed375
156 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 websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or redirect them to malicious content. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.oomewatersport.nl/upload/files/53909387246.pdf
    • http://hdurmuslar.com/images_upload/files/jokugutobuvugujezepaxo.pdf
    • http://mstreatmentadvances.com/userfiles/files/10012020936.pdf
    • https://jmclimatizacionhvac.cl/images/subidas/file/79395285916.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d8a45604683ba56f6cc2bbebc178ce2b/88159628437.pdf
    • https://alkathirilaw.com/userfiles/files/41955695193.pdf
    • http://zulaikhatextile.com/userfiles/files/zetorodoxorobiteluvome.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/luxijipidevurudivesofim.pdf
    • https://cooperspick.com/files/76224447130.pdf
    • https://widepolymers.com/userfiles/file/75889053558.pdf
    • https://sealand-pptc.com/userfiles/file/26618337033.pdf
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/60539668939.pdf
    • http://hftyby.com/upload_fck/file/2021-9-11/20210911040544668853.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/5dc0df1644d6c2f1e82a4773af0b7f14/64869498046.pdf
    • http://planetamama.ru/files/file/rafugewezofegikopave.pdf
    • http://www.deopendeur.org/imgUser/file/21918061555.pdf
    • https://bongkartuantakur.com/contents/files/babeg.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d9536398bdda20b0b2f364eaa716a286/bimogujejigebabuzijivef.pdf
    • http://gibisch.com/files/files/benosetalitaxubigama.pdf
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/ponexuvikewowobutuk.pdf
    • http://stigstudiotecnico.it/userfiles/files/2458893851.pdf
    • http://theclubburger.com/uploads/files/wewexomag.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=android+vs+ios+speed
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d73f.bin
2a412eeb798b88a109ab113a95be3d7f2bc0d545096035e88ba894457211321c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD73F 17348 bytes
font_01_sfnt_off0001045c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1045C 16792 bytes
font_02_sfnt_off00011c73.bin
7c2c779f1fcf3f6cae978b2da059301c1d02dedac9c73676e21f9647f0d35c30
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C73 10128 bytes