Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f03ae4f9878800…

MALICIOUS

PDF

95.5 KB Created: 2021-07-01 00:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: afde8d7fad0e867212e17ba7d526a0de SHA-1: 732136abe2b7d731e4399b642cdcf0adc5e152bb SHA-256: 58f03ae4f9878800c6cf69acbd035d9852761ad94e62c81763de101238044003
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or link-farming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to malicious content or further stages of an attack. No scripts were extracted, and the document body was unreadable, limiting the analysis to the URL and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://pistant.ru/uplcv?utm_term=creating+graphs+from+pivot+tables PDF link annotation
    • https://oncallanatomist.org/ckfinder/userfiles/files/ravogodajuvibokujufiki.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/312cd837b235802278634c2b0d246a91/5383555615.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/53307084141622491690.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d35cb6193dd---kakudasi.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210527185258.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/povegepawupedefetafubuwiw.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/32027114000.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/fc7d98abe4d3a392a390ffe7f2ca58b2/memalonudawolexu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d972e60b05c---56745010682.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/ijok876pqnp33pbubm71snsmr5/xoloseme.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e6260cf2b---gefutefixiwama.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/83205789969.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb6ecb3319---xezimirup.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/bgti9vr5st1athoe9ai8mm9tj8/jidagosas.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/13564115625.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/rebemorakom.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a17cb7da2---fejewuwunemaxew.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9f3c2814---rojinuzegebilimoda.pdfIn PDF document text
    • http://mebco.ru/images/file/tiwukorematumexag.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8601c88d2---sidunarijakajefaf.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/32532954194.pdfIn PDF document text
    • http://ipublicity.cz/data/file/finik.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/gulukenirilijisuwexo.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/93s7jvj8c7hcadmjio0tr8t16s/73279536737.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e7d3580b2---64510963030.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/jebubugaj.pdfIn 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://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_off000112f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F5 11040 bytes
SHA-256: 9d9a629c356ccf077e5b03d75f4a8cb6ec8e167ef747beec87d9d07fc13c4e05
font_01_sfnt_off00012c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C45 16932 bytes
SHA-256: 4be5d604db313412877707d2337148e83de9e0d1baf7c6b9c6df366abc9c9e49
font_02_sfnt_off0001587f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1587F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1