Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ec5a06809054ab…

MALICIOUS

PDF

100.5 KB Created: 2021-06-24 11:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a4b3c090d00813d36fbdffcabcca2834 SHA-1: 548424fcdfaf7696ba55ca4f0d51e3e687dfca23 SHA-256: 21ec5a06809054ab19648e09f2843cedf331cf940c90882e164aa8b9378e0b26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains embedded links that point to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to an '8th class English lesson', which is likely a lure to entice users to click on the malicious links. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://archism.ru/uplcv?utm_term=8th+class+english+lesson+2+question+answer PDF link annotation
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/6jgij4fprv67can13lr6qsnpp6/vilovozurotujatukepuka.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160719c04a00a1---dadekuwaxajurorakasop.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/pesetera.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/703b619c98dad396830cc96439ae273b/koxixofusujutis.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3f67af9b3---bodasuwovenebelosafo.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608119ca10d40---58681747548.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/nitunatokenu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/h3lav818l20ptb0vrbai7qklio/norusekanipofow.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/02d8ae001593e438c88bdb1073773267/mapekixibaxufuj.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a447d304f52---gazozad.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/kakajativuxenawulimom.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/58072826877.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/86vmgn3svadl34ivlr94at9155/febosemijajelulaz.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/pufizaxinememusur.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12bf1d9125---vipare.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11003 5512 bytes
SHA-256: 949f16702dfe95333274eca11a85b5596751e2e231afc0d67f0f1515d3f77c95
font_01_sfnt_off000122c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C8 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off00012e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2B 11280 bytes
SHA-256: 4d5e4c56a9a88dc074cf76116120e40c2748fcf08b64509cbc63cc57072bc404
font_03_sfnt_off00015492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15492 16476 bytes
SHA-256: 294448a99a23b597264d32d18ff223fc49cc510328562203cb1b4aaaa7fd5f05

Open this report in the interactive analyzer, or submit your own file for analysis.