Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43e6ad0b0c195e4…

MALICIOUS

PDF

78.2 KB Created: 2021-09-05 18:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20c6ce2e8f136f3c884be166aa973ab2 SHA-1: c78fda684a5aa58e9bc16ef1cd865e45ea1c32a3 SHA-256: b43e6ad0b0c195e47f1f55a2bef1190aedc4f90d73aaa339ca1a7f4ecdbfc796
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised websites or disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely a phishing or malware distribution lure. The embedded URLs suggest an attempt to redirect the user to external, potentially malicious, content.

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 https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/c57702d546c44fdea4a35b7dc249e784/84601216779.pdf In PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/liwajosuritegavirez.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/lanugororixumitosiwoturon.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/dukurex.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/ufari2vq0gibbsc6nvolocji7o/dojasafukivuditowarejevo.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cj4v8pr7si0bd2qofsbem4s1i2/72450666876.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81c6e1ec8c---45756283043.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8grll8hjqscqhvjgo8vfotcr22/zovusatuxonizamorovukade.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/32272946286.pdfIn PDF document text
    • http://cathayred-csr.com/img-cathay/files/kutowomuwuziwopoviful.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/wugamidis.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/12792298491.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/kudureluxajilekak.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/rixefoxifeguraminopaxeku.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/fomepu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608986b656285---88604176548.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608078de85b4f---48430487603.pdfIn PDF document text
    • http://screen.by/images/file/surabezabologod.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/fexatimez.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/kht0frs2o137nb15te0ld1gjg4/81928441344.pdfIn PDF document text
    • https://12waktu.com/contents//files/vakadipumamebo.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0d74a892a2a9ffda1ed14011bade0b60/fiwovivenukukog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=managing+human+resources+18th+edition+pdf+freePDF 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_off0000ce5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5A 16560 bytes
SHA-256: 0016038ac88b4dfe1049e028de55912f4c7bd069c9d1ca53f9d47b7e7050b400
font_01_sfnt_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C8 11372 bytes
SHA-256: 39de80440f2799bccf5928f735c622576911c24ad1aeff8e6fa514a13c9efabb

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