Malicious PDF — malware analysis report

Static analysis result for SHA-256 d757a2a2da85ed41…

MALICIOUS

PDF

74.1 KB Created: 2021-09-07 06:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f8d299dd29abc8b17dc4b64d3e725cb SHA-1: de701a9de09c3faf75c1ee0c2235b3897a7bb433 SHA-256: d757a2a2da85ed41e42d6fe1aca844b32f03e59b08d23ca4ed36c110a39c2da5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://jnnycc.org/userfiles/file/kunipemubo.pdf In PDF document text
    • https://art-lamps-rali.eu/files/file/lalevarunivalixuw.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/b2htcdk0i40jsl0otrtntbnml0/dinezazeg.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/86d4c7702ec03162bc75260744164431/89572787120.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/cc0e77c1484fa1125cf529ac5d313503/16860093151.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/guwelojejexe.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/40608113718.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/xedavubotes.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/zedufa.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/zazotafitakomevifekozuk.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16116e30dce8df---zusep.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/lumomuxikanofesinujedot.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/64302896672.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/mezuvebiban.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/43549295986.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/rutopevabokudarokoto.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/wavuperipolipipuxe.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/72614957976.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/72a06903b7902ffc66b844486569807e/literavukezaxusanulesoza.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b87bd9b06---kijojaxixobozuwuruxinuver.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/et3cro25rufp7r8qq5kqg3jd04/72073832548.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/xutarejibekov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=homelite+blower+26b+manualPDF 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_off0000bc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC25 10704 bytes
SHA-256: 3f6d2a57dfa2aac4bb7fb41ee781f0cf56af0fce6aa304ec323fb5bedcea3345
font_01_sfnt_off0000d4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BB 17932 bytes
SHA-256: c87be0890414839d335fc669bdf8f379bd927161b6b67425fb80a92625c383cc
font_02_sfnt_off00010312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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