Malicious PDF — malware analysis report

Static analysis result for SHA-256 f420fe3196b797a5…

MALICIOUS

PDF

86.7 KB Created: 2021-07-02 02:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a7ff8574c6ec72300457f08851f5102e SHA-1: 475f44ff80263f2fee70b2487354f8f2cd785692 SHA-256: f420fe3196b797a5d14d195568188bde9f2bc5759a0fb518f1173e7fdce67e77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to potentially compromised WordPress sites, suggesting a phishing or malware distribution lure. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • 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://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ec9d938f7781188e57f3237fa2d3ee11/ruzofuwopewaxevosufofow.pdf In PDF document text
    • http://littlepearlbooks.in/data/eimages/file/kefuxukoladalilen.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/15002370929.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/795a51d91bd2c8d6a37adf39a3041fc9/40305821809.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082e44120d47---43747284933.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/84c948477d3f352ea12a2207a879a423/29326817719.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/faxaxutijemewa.pdfIn PDF document text
    • http://vieclamtaichinh68.com/upload/files/82647543509.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/23994549761.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/52295178371.pdfIn PDF document text
    • http://mesterek.net/tmp/lugom.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a931d95cdf---69314120861.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/35542261867.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081dde27bed7---51867647418.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d05ac325---65159897078.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/luwopiwoxo.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/20092422322.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2efb8df270---83151840299.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a252e73e0---51934711285.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8ffa35297---19347786322.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/3192127022.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/k5odjjltkr86uknkm1erhosv4s/bofojog.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/8855516608.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/lumudubofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=a+man+in+his+cavePDF 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_off0000edd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 19632 bytes
SHA-256: 2b6659927107f7ac67c3ee953ae3710021959ae7eb239b4c50b3e95ffe61bed5
font_01_sfnt_off00011ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF2 10180 bytes
SHA-256: cc2792265904d54f8d8e3ad85f13dd1c3e8a04b76917a4e893f21d2827fe7d3f
font_02_sfnt_off00013588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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