Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73659abf11206a9…

MALICIOUS

PDF

71.2 KB Created: 2021-09-12 15:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8c5679a5dda953a05bbdb28921522099 SHA-1: fa57bcc06edb3ed2829cc2f6ab8aa6a7e823e79e SHA-256: f73659abf11206a9224955ad26ab15b494710381369ae4b626e39b476b59b7d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which are hosted on compromised CMS upload storage. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://chrisdepanneservices.com/Sites/cds/files/55360481289.pdf In PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090217070442.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/mezamaxid.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2d6e6168caf393ee14b266373919a6ca/bosirivuwelewefavawoves.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/72048330783.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/1317714766.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613988b2cae1f---45306658107.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/rivanedebab.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/laduzoxinufoparor.pdfIn PDF document text
    • http://tmtteks.com/files/dewarabora.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210908184543.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/nabowuzozukizoviz.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/godekigowoduk.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/92288853725.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/3548928988.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347cd6b70be---sipatafipuzivawawazawoga.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/tavokagixare.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/70124569518.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/piwizefika.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/45337632929.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0a4fe6b5f8f4a424705bb1d886b098cc/92423007390.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/90348905309.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/29767631996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=game+pokemon+omega+rubyPDF 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_off0000b56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56A 16356 bytes
SHA-256: e7e2a7ffec2d4c33e8fa7b21b838fd257aa78986d72b1a8a6dd4f9ccd4acf289
font_01_sfnt_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 10676 bytes
SHA-256: d1c14a55eba48476c17f9cbaa9a99c4fe25c8afffa507b8db26b8c5ac40eb849

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