Malicious PDF — malware analysis report

Static analysis result for SHA-256 457c08555938efbf…

MALICIOUS

PDF

85.0 KB Created: 2021-08-06 18:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 79aea948f70f33a32937b83aaf9cf0e7 SHA-1: 59700acae9e98b6ad794f435885be28fad432741 SHA-256: 457c08555938efbfc7742e536baecb9f29a5acfb832edfbc9c2388688b2b6be5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be used to trick users into downloading an archive, which is then protected by a password provided within the document itself, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/uplcv?utm_term=charter+email+not+working+on+iphone PDF link annotation
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f81937b5a0---jekulo.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/0429cad10fd9e74b30019bac4daf355e/tuwilononivarenasonubif.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/26847be5b8ee00e429ac1e919f8efc1c/reganudasemuge.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/gedolebikubumorabuminibiw.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/14318573228.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/85405993012.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf07bb0564---72778330822.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebaec7389c---paxivugatojasupoziba.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e69237e5caa---69248319370.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/4433117536.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/zoxubanepidudidofize.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/zedoxetadajesidak.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/57903909565.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070efbd7e0b9---gukogilojukarelomolezepug.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/bd9qfmnqlcsk65s5fe2p94n5ut/64341418483.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/143d5d1f4565494da6980c8a1ecacbc2/24779918407.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/ivg2qttj1eecds07renv3j46h0/tepugawejajegarex.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afff5f60eb4---larurufudeki.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4d19afb2a4e814609529f65af0c1dbf9/kevegaxabisem.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/16600926246.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39700cffc---46443657991.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/tenefarapebubisepe.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_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 17312 bytes
SHA-256: a0f3b6028f6d68c1d6d796f95e71607163b7fb73192c0ad34f340cda82550f2d
font_01_sfnt_off0001130d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 10740 bytes
SHA-256: 9e91e97842fbf654aeae773b0b686b21b9057dbdb8817e52dd399e6ffde34e78
font_02_sfnt_off00012b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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