Malicious PDF — malware analysis report

Static analysis result for SHA-256 9183bcb9c1400525…

MALICIOUS

PDF

72.9 KB Created: 2021-09-07 08:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6af24e438931e08ec544cee8a9de9d7c SHA-1: 1f9d8ffa4ff8f7961c259ee00b9c41818a9332bf SHA-256: 9183bcb9c1400525554687421fca6d188df142eed4dc5ab3118aefbae081cadd
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=kaplan+2018+sat+pdf PDF link annotation
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46fd590abb---nogolimilaruvapuwine.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d34bf37051b16318a4436d7c867ac994/jolesibanufepogego.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/91538439464.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/galutuvonitexurori.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/fevozidaselunid.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/metumeniv.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/bm3i284sqibmvv8s9hps5m0m3u/podaguji.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/b16725b518debc952597f35e03bc6b87/50429060426.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a095b678be0---71935358118.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/2fd78b56333b4c35dc841ed93bf568c2/roradufaradupimalij.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/datodakivokokuxajaxu.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/94e5a41dddbe5b7b73fdd4a8bf95bf11/kavofudonekuj.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806ad4adbd4---kigajajizonu.pdfIn PDF document text
    • http://teifsepahan.com/files/file/wufapolilevef.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f5bec5319---48159313688.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/rawitunugomuzoriwaneb.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da718c293ba---judaro.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971632cc276---71506879297.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609626c5010bd---47027277582.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/08/20/file/20210820_120013_167.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///jegizeridaba.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b59417bbeeb---48730511032.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161337e9592137---95845921666.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 10540 bytes
SHA-256: 18f176bc738f2d89af31894c7e83c6bd7bbd711f83948ebdbb21a06a50302ab9
font_02_sfnt_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 15868 bytes
SHA-256: 0c3b187e236c3585a824c6ad51c81ecccadaa354547bb067f388f1eb66553a85

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