Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e752dd385e931c…

MALICIOUS

PDF

70.7 KB Created: 2021-09-02 20:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfd5b43f1dd7fb7c9ce52a26af3aaef8 SHA-1: 59dee120db928ba404556c965439f7c81147a9aa SHA-256: 31e752dd385e931cf105956367099730801cfa7a5b6193009655ed4af1216eaa
156 Risk Score

Malware Insights

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

This 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, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=aggression+replacement+training+pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0661b448a---momem.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc20a855218---muzekaruroduxifefube.pdf
    • http://nonstopsushi.com/uploads/files/roninalosabalutasoni.pdf
    • https://anfauglir.com/images/file/lewodetibufu.pdf
    • http://kezmosas.hu/files/file/48029298167.pdf
    • http://tauroconsulting.pl/userfiles/file/togawivogetas.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b1000f7aec4bdad3d882f44202357ef9/70235898472.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/050e4bcf5566e7ca3fab71bdc692df21/77028692504.pdf
    • http://www.dereformasenalicante.com/archivos/files/jetifazuronugetamawo.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609df2748c790---walonoxiwaz.pdf
    • http://bronia.org/userfiles/file/sisukefumi.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef1f560b19---69043003021.pdf
    • https://healthmatters.me/userfiles/file/sufuwivusiwufiwalur.pdf
    • https://dadrarad.ro/userfiles/file/tezusofireniduvogojexuka.pdf
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/muzamimiranoduzagotapo.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5e63d6dfe---tilolozukegasuvexor.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8170b07fe73442a3e30bc7741d4ca6a3/dixibexolikivawuzuriw.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a376f45ef22---12030459384.pdf
    • http://sdes.in/uploads/duzojemezisizuxa.pdf
    • http://j1medical.com/uploaded/file/zoxudadalalurewejapo.pdf
    • https://sealskinz.ru/files/file/77336172872.pdf
    • http://klpa.net/userData/board/file/36499161801.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/logazevikuvimorumasotif.pdf
    • https://bloc-immo.com/images/20657979596.pdf
    • http://amoy-art.com/Upload/file/53741435504.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AE 16792 bytes
font_01_sfnt_off0000cec0.bin
993ee700b9983121be82fc1af74b06f422ea2ec522c9f2550cc52dd338115ac5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC0 14736 bytes
font_02_sfnt_off0000f41c.bin
f702a91cf77f9587c28d95fa36b25bacf7bcf803a3dbf369ead806b315d66d3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 10944 bytes