Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ae33432087b32e…

MALICIOUS

PDF

87.4 KB Created: 2021-06-27 19:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fbc23cef66983fe8df8f00b325430178 SHA-1: 29b231cf6f85299baee78d1e9fa03656efc5de23 SHA-256: f9ae33432087b32ece810e14da5234e5bbbcd452e4526839cfd08aa4aea2a7d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://koryosushi.com/uploads/files/46331203079.pdf In PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/7b1f9bd87a87b39d2e0fb81889475c43/tolariliki.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/69047336111.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/zimiduzetavakowavixibafeb.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/v1ltdo0ilrkni5ih1rik5of4h5/pasekajajuwizisadodofa.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/segisizezatoparozunuv.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/14619408781.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/cd5ca2e326b84fbc811f37d3537bc80e/ganelumin.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/28ah4lq3ni5vec4q5thlvpufs1/43734472213.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/54259903234.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/92214395099.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/26633fe0c12bdaf38a89bdecba056a8d/fisilovabov.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbf889dee6---67148658346.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/lipexigipew.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090337f35809---joxerojadovubemojizonej.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/nebezosumurepigeti.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/gs6hcpuqqfnbm0082ba1j033sv/fivosupukuvopi.pdfIn PDF document text
    • https://peterdegendt.be/file/94980334076.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78361f312d---19112908953.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210609052512_873927798.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/6a79a58a256bec26754be786d7c2a465/vutitejazag.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/0t3k07mcs1793f35s4gqmlf47i/jozoberexanesozowefa.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5880a9274---ravesozujapiraxezugesowed.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/70b33ddf6ebc19dcab097c555044fe88/nuxebejofiralugofixadoki.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/ronewotufotokada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=come+back+time+to+the+good+old+days+lyricsPDF 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_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 16700 bytes
SHA-256: 2b314c56c276fa7a27b20a712ddfbf5d24f809621f6312c86fa1fd984b186d49
font_01_sfnt_off00011e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1B 11088 bytes
SHA-256: 92a37e3284a7fc64051e249e46f99d153333aa1dd772eac0dd13deac95c3d0ac
font_02_sfnt_off000137cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1