Malicious PDF — malware analysis report

Static analysis result for SHA-256 07805a1c1bc1e2f7…

MALICIOUS

PDF

94.0 KB Created: 2021-09-06 09:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a0caa2540c026a98450ca671a69cfa7 SHA-1: 4e1f64ec2a42dc2e7e26d6da5f072fd9b1c7f34e SHA-256: 07805a1c1bc1e2f7fb4eaffebec80e2ea59a75e3194476ff239dffc9f28cab68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=el+necronomicon+libro+pdf PDF link annotation
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/1ofcthulrr81ujucdcfnhs71hs/lumabubivo.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/86594844625.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/50435680926.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/lularepigixofi.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/3212075171.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/nidom.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/27432404298.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///kigokowifimusimafurade.pdfIn PDF document text
    • http://bndweb.nl/upload/files/16392780197.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/20393077.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160933b509acbe---93555292643.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/domidixusedomajazo.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16097c53326ffb---88022623870.pdfIn PDF document text
    • http://mweb.cz/images/file/kinogotedunosajalame.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/96583952167.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/25163299222.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/98742076812.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161234a13040cd---morole.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9001ee8d2---74806873183.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e094cad60---79147639377.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/4381175188.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/10092181529.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160856e6f11efe---pofoduriko.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/nagaxof.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/kanoxa.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/xipojegazetixopoxuduwijer.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_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7C 20364 bytes
SHA-256: 575ec939126b5457d146bb4e3c51bc41a1f864d2ec9cd9492d7218bd34143d41
font_02_sfnt_off00015339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15339 10476 bytes
SHA-256: 474c3f41d38a763f1f45c78a2dc02f38e4fdaa8574cce0493bcad497d84b4835

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