Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e11580c2b67f99…

MALICIOUS

PDF

82.9 KB Created: 2021-08-15 02:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17e0156d09a350ba32d4d00faca29093 SHA-1: 17fe297f3863440399cbf1be7a20f1444e297583 SHA-256: 24e11580c2b67f998c61cb0986b1aaeef899a9327379b86b249fca3aebeaf3ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to exploit user trust by masquerading as a useful document, such as a 'redhat linux commands cheat sheet'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160775a8de6d34---34250255990.pdf In PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/6959bf9a28375ab8d9d57abe71feb868/fexawiribapa.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/904163013.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/443d59c839c10983d5a43c5d9ed6d73b/94619589598.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1228c9034---nogigusovubofebinaruvi.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210702054356_fiug1x.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/zizudojob.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/kirejobutezapadenodi.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/pikotanega.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/zopusabasawirepinebafeme.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608239f862172---balupof.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/vedowesewagupukejiliwetur.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/22354112511.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/52327676861.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/bowolu.pdfIn PDF document text
    • http://dges.in/userfiles/file/lonabavuxako.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ns08959t3rjtspqak76gb9qtmc/29638891779.pdfIn PDF document text
    • https://ienter.bg/files/52146602417.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/81811201545.pdfIn PDF document text
    • https://semut73.com/contents//files/togale.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/lupozudojibinepa.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9c7f9918d---69507647837.pdfIn PDF document text
    • http://4bx.pl/public/file/janumisebapuv.pdfIn PDF document text
    • http://jljemc.com/upload/files/weparewinenijuw.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/sixazetodemuravose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=redhat+linux+commands+cheat+sheet+pdfPDF 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_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 11032 bytes
SHA-256: b036c3ed23f188446bdf048578398dfc8abde18d92a7e82adf8452bf358cb784
font_01_sfnt_off0000f9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 16508 bytes
SHA-256: 32c8c939fc8cfbd9c85cf5e77a5f7c8e0e0ef5fbe983328905b8ca0e450b77c3
font_02_sfnt_off000124c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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