Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b0839736418331…

MALICIOUS

PDF

83.6 KB Created: 2021-09-15 10:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2afd625d7f6b861840b448d870131142 SHA-1: 03aacc034bb1c043c82fa2ee9c81213e56cf1180 SHA-256: b8b08397364183317a3aabb8176c6f252a4a71e79d070d131123d7ba80185e55
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure that attempts to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=gameboy+color+emulator+psp PDF link annotation
    • http://sibinetweek.ru/userfiles/file/87556687032.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/kunadeliwon.pdfIn PDF document text
    • http://sns.hu/_user/file/kenerilezew.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/44655096862.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/18130634922.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/jijosidize.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/73509328183.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/77320516144.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613537d22d20b---palikunotezumojoderas.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/34623941938.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412f6b249e1---42726940901.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e909017155---17967359969.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/daxoxileru.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/73344974531.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/66310250783.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0de89d2cb---4217359824.pdfIn PDF document text
    • https://resicolor.com/upload/files/debesugazofeniloronudemo.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/masezijami.pdfIn PDF document text
    • http://domainecomps.com/documents/files/kamibituk.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/zoxixenidexulofizun.pdfIn PDF document text
    • https://alohasafaris.com/files/kebazevadewujozos.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/66347731105.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/mowenitot.pdfIn PDF document text
    • http://biosite.ru/images/news/file/gapavegaxupipaxemopa.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/fusugupazibifowidanesilid.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_off0000e235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 10732 bytes
SHA-256: 8c0b1c77ec905bd6bf3430afe8c3d52f2ba5b32d96031a03c7bdf29214a8fa90
font_02_sfnt_off000112e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E1 17576 bytes
SHA-256: 88e6c5654168f65a67faacb4e47e759cc13e34d2ddf55ba561f9bb9d2f9a1918

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