Malicious PDF — malware analysis report

Static analysis result for SHA-256 14dde421d9bfb69c…

MALICIOUS

PDF

124.6 KB Created: 2021-07-05 16:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 47021e6ff58e693d97f3f311900dc61f SHA-1: 3fba38278eed957078c150b2588025268158e4ee SHA-256: 14dde421d9bfb69c33ccd06a6471d1c82107b8f5905bf070d86859e8a69c53ef
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs pointing to compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of multiple distinct hosts and the use of UTM parameters indicate a coordinated effort to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9788

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/61360521201.pdf In PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/8b34f422652f1471b131a1506a782175/31324044623.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/86560390892.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/79baff9f27993dd9b90138876679feee/46563096963.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b3c652eae17e3aa7e1e41e2285541a1e/gelufew.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/k95p3s2dq8jkhfi55rietmlcuv/xezafawefe.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/leturinelusepenikukuko.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/jotajonigaxatasew.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070feb7b5387---29723655385.pdfIn PDF document text
    • http://healthywithhart.com/res/file/tovezetoso.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/500363d858dfd501a5cd70886453d238/masopeberovojosakipuguw.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/2ea6fcbaad7478fca5a7703257bb8f81/jijofutubudipesavuwiwi.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/tk8apldtu4lu6olci31ktp66a7/91337585496.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/076ad4bcb2b45b2f058310798ffbd6d1/xewojedefizupebavol.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/dd302f2482405bf39b505e5da929ed94/78226039803.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f97ed94da4632b4650d09c99422f446e/98092067750.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/sazafekudu.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/ferebewozizimofit.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dc8a2387f---dotezebugukiteken.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/dilebe.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/55285968638.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7vfrd3733tnlnlk3aotm96rem/83263613327.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/8d5sh61715bkfems3gaat6qvp0/63732128443.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/mivajedekodobovaf.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070a2905519c---zavavifusunolikujazoxu.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/f3ci27jd2ajmk0uuaq6106n453/5925100181.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210615_2B602516F1C08B4F.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=great+weapon+master+5ePDF 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_off0001873a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1873A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F51 10536 bytes
SHA-256: d5389291a26919b9fe7bc0c030424fb4329c810c36b0d7f1b0ad5ea10e54123f
font_02_sfnt_off0001b771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B771 17852 bytes
SHA-256: 1c79af52ace1e462e22c3ca1f3f5b5517630e114e906179cff02610a71f2003e

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