Malicious PDF — malware analysis report

Static analysis result for SHA-256 14e09ef2192ee306…

MALICIOUS

PDF

82.8 KB Created: 2021-07-02 08:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4b240af82bc4c5c4aa714a3775126b56 SHA-1: b85995f19550b1f3396a803c106803728c79d231 SHA-256: 14e09ef2192ee30675376ae916bd4046b24995bb40984096464d376d8ce05dcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to compromised WordPress sites hosting PDF files, likely to trick users into downloading further malware. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b18f13a650bbfbb73eac868147b5038e/7765572843.pdf In PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2462f49d51efdd4e6bc9993437a79419/39636944422.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210629191050_e2r325.pdfIn PDF document text
    • http://mousike.it/img_ins/files/52491548644.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/dc248ad2a1a8043df920b9925b2cd949/zakim.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/32968932785.pdfIn PDF document text
    • http://sy-smile.com/upload/files/65267600123.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/fugovafepukuzugokidekol.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68e8f3946a---lojasudijizumuxukekibi.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/somoj.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a17962f0bab---88848761229.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/68316834340.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/haobds9jcm77ojckf1eq6nu1hl/2748737738.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160868fba1cf59---77022499668.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc686d8b1d7---wowaza.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/o8ql0jlf9sn5pukvsnj22tq0v1/68998654675.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/mesukubalojuxoparoganop.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160de75704fa36---gomobididefasinunaj.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/46342226821.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/96174617799.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef2085c06e---nubewizevaxaduvawifuvob.pdfIn PDF document text
    • https://masihpt1.com/contents//files/samosaxuwudaguvuz.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d442f161f03230c5f7558b685d64532b/80237277358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=english+question+answer+class+7PDF 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_off0000e120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE120 16764 bytes
SHA-256: 710646d8e4e94f5645005cc62feab5263bd60895c1f6f8458d142ae594c12be0
font_01_sfnt_off00010ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE7 10872 bytes
SHA-256: b61c5e36694d3a320e1dacd15ab5522127d50069f43b1a3a0efaa736c71597e8
font_02_sfnt_off000125cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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