Malicious PDF — malware analysis report

Static analysis result for SHA-256 2036e4e6421e5530…

MALICIOUS

PDF

83.6 KB Created: 2021-07-17 23:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7260265f27599ccd4fe7c3201bb7dcb8 SHA-1: 396a743e6bd331d62fefd61c2fa29afd87a12805 SHA-256: 2036e4e6421e5530fc085429d7d6583e30a09ef937e336b08f5f8028e8f5eb74
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple compromised WordPress sites, indicating a phishing or redirection campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to exploit kits or further malicious downloads. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://itacademyindia.com/ckfinder/userfiles/files/41976810870.pdf In PDF document text
    • https://betenenergy.com/sites/default/files/file/salewekupupixu.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e410520c72cca82e1e01849c47ca2fb5/bozowexunulugomidafet.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/s54riedmsodaukousduth56g16/kozolebojubaliliwiwip.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/06c574a3759a736560c0e4d7ae6e904e/67418214425.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/51370637192.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a300ed20153---vewiwinofozejemu.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070de24277ad---2150645095.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/39092240535.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/sumelexeludozapojisupiv.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/mizedabugikikonazos.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/tipolunugirugetobapoxu.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080af353d25e---pitewimuzujajugi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/437d570a62d665f182d50cab4f4644d4/25368514533.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210625_182508.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/88665357693.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e5576084---kodugozonodomosovutajebax.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b3d75dfef---rimudexonakiwavuwogaj.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/c2iu8ml30tvjfu0t8sepfqitsc/gupetavexazik.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/xonuxi.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16089e1fdd6aeb---26638416065.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/53403648953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=sample+size+and+variancePDF 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_off0000e355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 17300 bytes
SHA-256: 455a0acf65dbd8647abc58ebdbbad5db5620e33273d009d934548312782291c1
font_01_sfnt_off000110d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D9 10660 bytes
SHA-256: 26c5518f3fd8e98da4ae112721f701fe340b3ec237f3e82c2e25213ce516cc07
font_02_sfnt_off00012937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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