Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f76905c5e3c376…

MALICIOUS

PDF

86.4 KB Created: 2021-06-29 07:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 15bdda652714a6b71a14f3244ad000f0 SHA-1: 9594cd7f5bc6d66408364ee0a03fe24316de1b3d SHA-256: 37f76905c5e3c376b0e0cdc1a984b8ef37eb669b7a5019b004917a4d9735e582
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. No scripts were extracted, and the document body was unreadable, but the heuristic firings and extensive URL list are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://cructi.ru/uplcv?utm_term=types+of+school+at+secondary+level PDF link annotation
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/0b38936a61cfb9807b196838829bd4e5/kesiligezazilej.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/4144171697.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/5iok0bjq2i3efg5u7aails69rm/56500588567.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2ecdfebf---jexurokizo.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/xonumasudoti.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/79643729446.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/88358d4677bcc2e467199565142c49a9/65223122527.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd38ceb1104---kogojuwobiv.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608465a3b6be7---6906625258.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/812f97fa5eb864b8441664087bb3c18b/zevevasebijarim.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0bf166b6e---xupogenulizibepilive.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/1ffbd83fd6d6e8d8a3f2547278641820/79689324818.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094503a48fae---57674000564.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947d4d54976---nepidurizomibovog.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c29ccd26937---11341818036.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/zigivumokumamuvefu.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/9rft7cu64fcc0j8p0u134r0rf5/kawagikerabulukaferine.pdfIn PDF document text
    • http://aweibel.com/Photo/file/82808865402.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084952918f18---gerekepiv.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160986276aa25f---26893580487.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/6c5c2cfd30155960d0d15c321febaec4/janurosinarox.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_off0000eb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8F 18144 bytes
SHA-256: 4a65eb6337121ae0e876b518bdea5de7b6dc0793dc07f7e31966d1f4eb5a6fa1
font_01_sfnt_off00011b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A0 10768 bytes
SHA-256: 27c1ae444e2db6bab37ac478d21351238332c825170369ce9c76ca35efe2271d

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