Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba24b3d6878da8eb…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 02:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c7cd3229a7b539c918d7026324aad2e SHA-1: a68c6e3db7d372c3be1fcef6aa037f3b555a8398 SHA-256: ba24b3d6878da8eb400bde5c0196f2d0f995760a81f1aed530b98280179f05f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://catamma.ru/uplcv?utm_term=hill+climb+racing+hack+unlimited+coins+and+gems+download PDF link annotation
    • http://arcos-eff.it/userfiles/files/52619408352.pdfIn PDF document text
    • http://195exim.com/datas/files/25190025392.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/40434685410.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/27376631428.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/42635210107.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/67666117320.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/51810288653.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/75139687776.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/96231139965.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/zixizidalesumesepoduguj.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/duvapudix.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/52424055115.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144442bd5a4e---loxegolisojawifobi.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/45329728307.pdfIn PDF document text
    • http://baove24h.info/upload/files/wotimofojolawapogoletaf.pdfIn PDF document text
    • http://sciattella.net/images/file/danudijij.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/lawafajog.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/44806101740.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/kesuta.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ecad80544---53026263635.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/361638be82d688e48c7efcad6084f12c/xazujisumalaxupetub.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/20378847994.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344251584fd---1266581680.pdfIn PDF document text
    • 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_off0000d6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 11224 bytes
SHA-256: e769438fc10462c7c9618c5205ce4d1d35bc3bbb7b9c7d93b81f5c714030dab0
font_02_sfnt_off000108ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CA 18412 bytes
SHA-256: 6be6b38465ad514fdfbefe0d73c4855985ad84b7d451d6b7216021538943112d