Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefe345f1215f9f4…

MALICIOUS

PDF

84.4 KB Created: 2021-08-01 17:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1b978e36a48dae9a2cb83bb41699102d SHA-1: 7e813e0d29103161f116393f190f55aff6e4696e SHA-256: aefe345f1215f9f4b1b4436b3d33859d974b462dd7c07f767c656902ad2bd432
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a password-protected archive lure. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting an attempt to distribute further malicious content. No scripts were extracted, but the overall pattern indicates a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/dad681afdc9c239b3f1b393cdf961912/79451168873.pdf In PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c3928357b6d---mezideb.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1ed90b5a66f9c9b19df241c59018df2f/3236702743.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160963bf500078---79149196156.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/zudunizasukofunisop.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/baletafevas.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/bed6b63c5e8433a924e0490361305d99/xiwojiwogitezife.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/sapomuribesa.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0417bfa77---73570327987.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/15f31ede08e6f8360fa5764906a04dff/joxaxizazitefikirokufapiz.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab5538e1f7---4954594913.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f1bc6557f---77263096455.pdfIn PDF document text
    • http://henrysadiereunions.com/clients/876463/File/94077801932.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/69001934396.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609619157483e---kiganorawise.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fcb311aa0---66881875871.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/mufuz.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fe4019c26---pogujokebuxelen.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/81063801346.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/reburudoxotu.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202165124649848.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b91bcbe34c4---nugenu.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/16490908078.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/cbhq02b11bnvaov4pn6tskgp12/mikunobuvona.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/189579605435210922a666230f2519de/58109480897.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160757c3e3169c---vamesiwadonalof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=solucionario+matematicas+2+bachillerato+sm+saviaPDF 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_off0000e011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 18416 bytes
SHA-256: fc29c23a5d2169c23ff741b9d98b7387685e14000beeecfe23cd601a69c93a87
font_01_sfnt_off00010ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FE 10996 bytes
SHA-256: 239530f092f585f5740d3908d9f0d45cfd53d168052efa91a1622f4848ce8dc6

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