Malicious PDF — malware analysis report

Static analysis result for SHA-256 152268b6768f3976…

MALICIOUS

PDF

72.7 KB Created: 2021-09-13 08:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 484a663b8c37f6d1a2945ff0d15d8f76 SHA-1: 80a3e909033c74e240d34423f233c938c6147b75 SHA-256: 152268b6768f3976ab13fb54d13b97c571efbee6a92ffb2bcf7aaaf2bbefae15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the nature of the URLs and the 'SE_DOWNLOAD_BUTTON' heuristic suggest the PDF is designed to trick users into visiting malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=asphalt+urban+gt+jar PDF link annotation
    • http://orchid-daikanyama.com/userfiles/file/41768802190.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/14355347397.pdfIn PDF document text
    • http://tai-group.com/upload/files/lejubodi.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109080907002992.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/tijulefimu.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/darivijofewapilag.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/40531477030.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ced10bbedea9fa74ff3c65c97415347a/63774609928.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/xirovokuki.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ofcmqvf87ropeskfpdge9vjnsn/gejojakuboziwemalobub.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///30331651144.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/66788616419.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfcbedba52---bevalod.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/70318418869.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/47178651968.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/39494762691.pdfIn PDF document text
    • https://bunianco.com/other_files/File/15963714464.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/nujaxikujojutogunox.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/tezafegin.pdfIn PDF document text
    • https://ancoraeducacion.com/images/vunej.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/rowufonasinegokivuboti.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/47533446049.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613125f23d3da---43084700559.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/rawegufinigugud.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_off0000ba14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA14 10536 bytes
SHA-256: ee38a051b73b34bb67135c46f44a38416ec450d619e7a5bac742f84fa2173a08
font_01_sfnt_off0000d1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 16908 bytes
SHA-256: eebc637cfa693a62bbd29d09c00f8d4b812ffab1b8ca87b6e11eb1d244065f5d

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