Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a1077f88a35bd0…

MALICIOUS

PDF

76.3 KB Created: 2021-09-17 22:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14e58c1b1af39f899a3383e1fa4085e1 SHA-1: 1b40ced0143b6a3adc4caaf9ced78b02a2001d35 SHA-256: 94a1077f88a35bd0c86695a1f20acb32bd1d7a6c7469f94121fc8da7e546910b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, including compromised WordPress sites, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

Heuristics 6

  • 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
  • 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://archism.ru/uplcv?utm_term=big+brother+adult+game+apk PDF link annotation
    • https://ibrahimkoc.com/images/Media/files/89053291400.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/jadixuj.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161430b73d28ac---23436110069.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/85006099498.pdfIn PDF document text
    • https://clickbox.ro/images/file/zusoveziw.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136d46cb0224---98127469419.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/35726459259.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/89176249802.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/87970066414.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/68909240.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/34857936615.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/99723338900.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/oaldsoi2rb5tcetmoksjf5qnfp/zopafore.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/31549432977.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/24676653534.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/76073134471.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/19505564282.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-5/20210905082321476931.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/dejejulidibesomuzuru.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/43967954365.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/32422469729.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/24517023837.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/daxidozetekitejero.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/kesomenupideritufixidawo.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 10952 bytes
SHA-256: 4e822abbe1d39cda1e87feb6cd55cfa8a6c5efd169d8e7bdbdab6fb1c02063ac
font_01_sfnt_off0000f1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B6 17216 bytes
SHA-256: f98c7e219bbd6aacb7add2f5dcbb357df7766be1c2c86eab79525c2a1b08d3c8

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