Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fd252baa89265f…

MALICIOUS

PDF

100.1 KB Created: 2021-07-02 09:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5952fcfc866417ec544e1194d5482734 SHA-1: fe679ddc9216f08c36e6dcde59d8ad418cc4f95c SHA-256: 31fd252baa89265fea743cb143cc131fd74bb52a0a4268d699d69f88104e4996
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or are hosted on disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://hawks79.com/clients/85064/File/705478935.pdf In PDF document text
    • https://theelementrama9.com/userfiles/files/dibuvupebub.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/uivth4fgc005sbkpbae8cun3db/pomuxejorofa.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd5e27c6624---99679828178.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/79112495682.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/muruzaxexivelibap.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/saxijuzelugaturibelis.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf17c2f1a8---32703367756.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e651d32b---70728982684.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/5748785086.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/87f67a6daa06e526718c3e74f75d478d/92886861724.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5bd47afe2---81007403241.pdfIn PDF document text
    • https://wrd13.com/force/file/vototoxobanut.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/duvopoxekoxuledego.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/munowifa.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/82428253096.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcea20acc7b---88977668023.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/sedew.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2elr64qle3oi9etdvqb93l3alf/24225977486.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c245233b143---disonogevifapagenazojeweg.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/78065343155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pay+vehicle+registration+onlinePDF 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://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_off00012634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12634 17152 bytes
SHA-256: 11d2347931c6aaa32da9b67ab8289cf310aa1106d89b94a1a2da70756e0382e0
font_01_sfnt_off000152ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152AD 10688 bytes
SHA-256: 2824181657733b115f4d60422d5650086ea01ee444759eb431ce678236d6dcd0
font_02_sfnt_off00016b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.