Malicious PDF — malware analysis report

Static analysis result for SHA-256 282eb03e3363f851…

MALICIOUS

PDF

83.3 KB Created: 2021-09-08 09:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 490d768b8fae0a360a53b3e9c30894a0 SHA-1: 0c8ec55155f8aa8760259aee797074158ed9c284 SHA-256: 282eb03e3363f8512d2df1b625428baa9592dbce84a0a4cdc14c2dca249294b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous links, many pointing to compromised WordPress uploads or disposable domains, strongly indicates a phishing or link-farming campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.tivafa.hu/upload/file/81913576987.pdf In PDF document text
    • http://z-sinpro.com/upload/files/13578516065.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/74855989247.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/33753602509.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/2cdc96a7a4621342cc8421d415bbe57f/50384342043.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/1411254461.pdfIn PDF document text
    • https://migger.dk/userimages/file/medisopilalawaxegerupoma.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/6lj0kn88nnc9oqfnhf5e7vglic/76971384858.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb0714e88e---malevazelobusijapokexiji.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/bth0u363bmmfvbmstvluteuvd2/44129226463.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16111de0d95566---78583798272.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/0ef1eaeefb049d5c58e2a62696e36418/88638024739.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/lonemotuxunevusexexawu.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/cc20d73d16e91d221fec2d97dd18a80c/vaxasozanadaririrade.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/3vmbus39r9g1ao88ks7pi78125/pogoralu.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a69b2d18136---timixipurekupotemanajesi.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9128cd8a2---67426007233.pdfIn PDF document text
    • https://mfdesign.hu/files/file/jibovaximofubogomazov.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/2883525465.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/wovozejenesatanevozobog.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/vt34ep7j3lh7gbpf3m6rt6arp2/27542078489.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/lalotejuzomupugozuku.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/k3bvavd9krkod2iic868sj7foj/60285168565.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/38924086542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=personal+safety+worksheetsPDF 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_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 17324 bytes
SHA-256: b81456c9ec8340873a57aba802b3b48b102e09e08e930721ab6949ac1865407d
font_01_sfnt_off00010f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001277f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277F 10512 bytes
SHA-256: 43aa728209a3a122e39415816a77620adc5003f4fea998a80cf900670be2927b

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