Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcab7ac0470f7c57…

MALICIOUS

PDF

69.3 KB Created: 2021-10-04 00:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18bf3265033e8180fc2f274ea4e8b35d SHA-1: 8dab419009acdd69aed2e1e78ff4b6130cbbbe50 SHA-256: bcab7ac0470f7c572dfb18185d037a3703ed0a3b0a5a9f917c8e45b6c82b6ed6
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised or disposable. The presence of these links suggests an attempt to lure users to external resources, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://parateam.cz/file/18156301435.pdf In PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/wedagoputifitemawaxeme.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/91269672189.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/dewarajijijetubufewosi.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/37266248781.pdfIn PDF document text
    • http://kidneystonetreatment.in/userfiles/files/11898794710.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109250008497424.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/dujaxotebotobobupir.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/pifotajelepovibiju.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/96328058981.pdfIn PDF document text
    • https://medtek.vn/storage/file/50285080093.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615a1f74b4e90---20548137817.pdfIn PDF document text
    • https://yoimart.com/upload/file/20211004060602.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131f94cf2d5e---xopomasiban.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/51245162683.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f841cec4f8---13662480868.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021092200063573499.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/lelujunonupozotu.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/susegigiwipekojunorumed.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/dikikedovajusila.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613faafc0a107---figuxibotufedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=should+u+text+a+guy+firstPDF 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_off0000afa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B8 15472 bytes
SHA-256: a873f5684d43c3eda7b0dbc93ccd93a18c2834cb2c3264b13a3fb75ce1bc8200
font_02_sfnt_off0000ee62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 10920 bytes
SHA-256: a81272ecc77ea42634ae9ddd9ca073cbc34d0d53ce82326ad0a10758a8be170e