Malicious PDF — malware analysis report

Static analysis result for SHA-256 06656da14e6bdd08…

MALICIOUS

PDF

193.2 KB Created: 2021-06-19 08:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5bb76073639a87958a7775759fa13b50 SHA-1: eb2bddf4ffbd26bef49bfdf5dfefbd686efd5ada SHA-256: 06656da14e6bdd08c891b1fae2bfb962095dbbabd18f5f2d11f79f81ce4a1795
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are part of a tactic to redirect users to potentially harmful content, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160939f72ea415---64545253223.pdf In PDF document text
    • http://onnetsolution.in/userfiles/file/depenuda.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/fevegasedetuxujupeboz.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/8c2aeeb59ff73f62eff06ced760726d3/37751803220.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e054b8564b7e93d79d6eed83c007ffb7/tubaniretiraki.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/muzam.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076c97865c71---lafigipef.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f62545de5---4805538061.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77d166be5---27267160750.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7bfb8d7bc---bipubawafilegimobogemekim.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/92494035262.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c79686c3e89---mefogekevavun.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/kenizewimekogibezulavab.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/fadusiveninezinepib.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f125fac8ea---86591729092.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/aec582ae7c274e6e905990670e31dcd7/ruzeribenodivuzoxuniluniz.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b0d9a1bb38a2326ece4d5bcb1b82f2a2/wivexonepozuro.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=srimad+bhagavatam+english+pdf+free+downloadPDF 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://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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off0002b4da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2B4DA 22200 bytes
SHA-256: fad9bf20680506e1f59d56dd1cd1dc06d6c41db442afd9e5ee12d5bbc60f86f3
font_00_sfnt_off00025d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25D7E 5636 bytes
SHA-256: 6f6187eacaa7bb5338d51ed1162706e2195d36e7385c94f83b6195c68f703f6e
font_01_sfnt_off00027083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27083 3772 bytes
SHA-256: 9389eabb5da0f7ff5893e499ff791b47d46466a46589dcf6e6727fbd9e34bd63
font_02_sfnt_off00027c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27C29 14344 bytes
SHA-256: 10440aa5ad4ebe735fde1411357e529f9c0228bcfe32470a113e7f044fb2e15a
font_03_sfnt_off0002a6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A6D8 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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