Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ff72fb72649313…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 23:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a395e0450414b8bca70c9ba0dcab028c SHA-1: 0505855b0a223b15c7032b57d554fa1292da2e8a SHA-256: b6ff72fb72649313eeb9d93979f56f2ee07cf800c73dc789381ceea537f7f1c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and link farm suggest an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://huntic.ru/uplcv?utm_term=mortal+kombat+x+highly+compressed+android PDF link annotation
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/dea52734b3502569b1e925f9d441530c/zigugininoleko.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/78295cf03c0214b2766a0a12f438965b/nenijasenomerid.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/vekixu.pdfIn PDF document text
    • http://citranco.com/users/files/69582860641.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/kusakabede.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/kibagi.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/24913948419.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced4338514---moxaguwodonizupe.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/85545170693.pdfIn PDF document text
    • http://caythuocnam.org/images/files/raxipumumojop.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/wilutul.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/kimujug.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/lekakupenanises.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/49586185519.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/bewobetevu.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091004092873499.pdfIn PDF document text
    • http://domexpo.ru/up/file/fovafugatilomitebaf.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/wevixulawonagimopekikimed.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210911071647618.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/12789974242.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/57311435197.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0adbd8e2d2c2da658c75e435b841d706/49184263509.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/8118863428.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fee66c9c2e---makovaxudikesiderafeteji.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_off0000db77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 18340 bytes
SHA-256: f5c481a8946341d0aa79c4981d38675fa91fbca2c61f3827e038dfccea36e867
font_02_sfnt_off000122d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D5 11404 bytes
SHA-256: 971ac71ac150a4f33222c33780cc2761a312fb5e6920e62fc5ac0e8299c92439

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