Malicious PDF — malware analysis report

Static analysis result for SHA-256 b366c7c0639f2644…

MALICIOUS

PDF

71.3 KB Created: 2021-09-06 11:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53393b6769bb4e639e7c41877515ba1f SHA-1: e908444c0c5336849009b177bfb95c245fe139a0 SHA-256: b366c7c0639f2644cef232dd3df3f55b65e634aeb1a5165d22f6e5af32fdfac0
156 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, many of which point to domains flagged as compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings related to link farms and compromised CMS uploads are significant indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://hainescentreasia.com/images/file/24779420636.pdf In PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/42213430941.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/foturuxagorolosebatuvebaf.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/32514439851.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/debovekexeg.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/pewajevew.pdfIn PDF document text
    • https://invest.pl/userfiles/file/20095049469.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1627280438.pdfIn PDF document text
    • http://www.ximangsongthao.com.vn/app/webroot/uploads/files/letavuximibapibasa.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/50587672344.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/162071f62e31f33d96c9562b43c4c704/8729890329.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9dfd35515f73f68d1ae3ce97aee94c66/76889357981.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/zuwediwazenetopez.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/16385316477.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/zepiwoz.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075a34524060---22859870481.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd779ecd23---36378733220.pdfIn PDF document text
    • http://ramz-alqassim.com/Files/files/pefobabow.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/6u43tfq58j1j0ehk229prfim25/63117347976.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/buzitumuriminaki.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/bumagipusisufolekovejev.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/fivisadeziv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=genetic+drift+and+gene+flow+worksheet+answersPDF 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_off0000b514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB514 16064 bytes
SHA-256: c39f62f4b721600c3bf2d51775c5199091fd92e046d767e636b2b68f12938d7c
font_01_sfnt_off0000de35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE35 10972 bytes
SHA-256: 94a5c125620df3c32cfae96bc8267f5731a78ecc299c0c5a51a234cf5963c0a5
font_02_sfnt_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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