Malicious PDF — malware analysis report

Static analysis result for SHA-256 150bfb2706322771…

MALICIOUS

PDF

89.5 KB Created: 2021-09-01 21:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd7a056d1b4a81b1d57e7247d68fcbb2 SHA-1: d122e0c20dc40bdcf77fef063838b894627210f2 SHA-256: 150bfb2706322771a76f63ca8af6786aa925df39b9e6d6567f5464b422c8555f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to websites hosted on compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://nguoixunghekiev.vn/userfiles/file/jevifegotinomevometikifon.pdf In PDF document text
    • https://koncnc.com/genelresimler/file/tibux.pdfIn PDF document text
    • http://dothi.info/images/files/19275450545.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/tikemunubewuxi.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607631b5db976---navapal.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b83c4aa7---89091116658.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/82072904507.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ti45blnur2s1k71oho7jjorios/foseparijijol.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/52a3e48e7f2d603b5398965398a5044c/37878555464.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/12665992429.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/41446709254.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/83951622969.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e889d46dcb---54104258931.pdfIn PDF document text
    • https://csn-alliance.com/data/files/27955587440.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/zilemotanima.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106282332.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/59200782582.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8b86051bf---16538688784.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/5dh30kq05rds7komvhtnc8jvpi/nepupixiwexiruxujexeware.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/61332925812.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/17feebe36a3fe4aaaa9bd9f5dd749c97/69528536435.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/31801879666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=brain+out+puzzlePDF 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_off0000f838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001104a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104A 18444 bytes
SHA-256: d492938e07610247e4572d65bf7c8c2e0309f15ffb4999ecb8a898c616860496
font_02_sfnt_off00014069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14069 10292 bytes
SHA-256: 1554ff404b053f66429f2ff81d5fb22ab8df5584c1127c93975e55d89ce2563e

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