Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7367f42ac4cb82…

MALICIOUS

PDF

89.1 KB Created: 2021-07-24 19:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cd80f5211ccad6724ed3f9a2f01565d4 SHA-1: 2ab698f8ddc3f55bebfc54d80d29eefa5f923814 SHA-256: aa7367f42ac4cb82b0903e9fda300debacc551f25f4071305ff831f7182e2eae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised or disposable domains, which is a common tactic for phishing or malware distribution. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to leverage SEO or compromised infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cokhixnktientien.com/Images_upload/files/21537083054.pdf In PDF document text
    • https://rijst.nu/userfiles/file/85133071549.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/xulorafodevolibirobo.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/durowunojojeko.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba51e331860---pozamutoxojedenilamu.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/2vbtqrcn176c9bvhonqt3nmkls/kogapobuwusekuvugolobob.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/kutugemogukudasazut.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0752711f14---21079456535.pdfIn PDF document text
    • http://epmachine.ru/d/files/34437842955.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/36429754202.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/74567153554.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160730863cd482---34536444515.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609073bc9a3ee---gibilelitigisoj.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/vezemirajidexapewasotubog.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/19645333181.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087b11671388---45840389756.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/45316459062.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/taparerezuwigurakuteb.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/12386218472.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093c73e6a1b8---wiwedokonomozuwaximu.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/klkmsldvl202vm3pe2g6cjm632/17653106889.pdfIn PDF document text
    • https://elektrona.cz/files/file/41512278015.pdfIn PDF document text
    • http://sneedfamilyct.com/clients/44919/File/dabame.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/kufiribudinifawi.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/50872720893.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c7e917880---tativepogitame.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/pomivozev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=league+of+legends+can%27t+change+region+2020PDF 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_off0000f47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C96 11088 bytes
SHA-256: 25700f7c510d8de0202fd31b56d676d113342380d839d9eae91367a824a563a4
font_02_sfnt_off0001263d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263D 17480 bytes
SHA-256: ae3389f3fd129d987800d42e7e95665a27c8aaf09d65c078aabdc3291f6e1100

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