Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aec5f9ae0d3ce81…

MALICIOUS

PDF

95.3 KB Created: 2021-06-13 21:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 93ef500ef1dc8e4cab3e3355421747d6 SHA-1: 4721d14615f12c5a110354950f042ae861cad233 SHA-256: 1aec5f9ae0d3ce81d38fa9f16c1d5072f5da7d195b34f521060c04ef8ee8882b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The ML classifier strongly indicates maliciousness, and the presence of external URIs and link farms on disposable hosting further supports this. The document body, though heavily obfuscated, contains text related to 'information technology ppt presentation free download', indicating a lure for users seeking such content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://garglob.ru/uplcv?utm_term=information+technology+ppt+presentation+free+download PDF link annotation
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8e3e0fb49---50396423039.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc210c1072---93450166209.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7585e4966b99bdd7f3704ceca9c376da/27647711141.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e6face79d---lupalutojozab.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/47ca22a19e48c51dd0ddfd975b2f71a5/vakipu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9f3c2814---rojinuzegebilimoda.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/83181954408.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b99f5028ad4---deviginiwusonok.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/5473e7b9622a01abd805d694a8a2a138/bijezuxujepa.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0d39a0476---84627253758.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ulaph3sp1l2h5v0r7ih809icm3/netigefajejupurupafira.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/35951852430.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/0ngv6kttvql15lck369pfretrg/sedolijovubofenidiweruvol.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/ea1e10e244ebffea4b866d689fc5d5b9/zajuseta.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/10894042702.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/48569716953.pdfIn 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
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D9 5488 bytes
SHA-256: db9ff5599f144f73703e60ff9b885cbe7fab1729ee43921e81ba08c5160270c1
font_01_sfnt_off00013a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A66 11012 bytes
SHA-256: 5a2aa8803c522ab79f6d56375ec619f4a855fa3b23008e329c735fc9bd850257
font_02_sfnt_off00015fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2