Malicious PDF — malware analysis report

Static analysis result for SHA-256 035ae8aec20e5e5e…

MALICIOUS

PDF

75.4 KB Created: 2021-09-01 15:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 650662583fa36c31e87fe311843c0cb6 SHA-1: 5e0cf583b65d966bb0e0737ad905e873ec0740a2 SHA-256: 035ae8aec20e5e5eb3e08938410b62f1b14efb54f47d589b87c30e8621e019c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual content, but the heuristic firings related to link farms and compromised uploads are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://parlagame.com/calisma2/files/uploads/winekusa.pdf In PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdaa40353e---duxaralodusudabovu.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/kajuniwuf.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/99778555950.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/siwekerapepalozuxemor.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/4981057693.pdfIn PDF document text
    • http://ropesadventure.com/d/files/17246663056.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/kulupupexopegisafaw.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/mopegemavasakariforez.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/47073717824.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/11541414431.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e28d3a41c1509b065a3e963b9daef80/dewewalitubavinuvazili.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/jizuwazikasifokarurobo.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607342193ce0e---fimagebedaxinajatutoborif.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/19834511202.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/fec24cdde45d5b616e587b60576f6449/86225414661.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/81601860884.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5e87e814f---gisenepolubinurabe.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a3093151d3---6440483861.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/38840051310.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/nsncqi7hiugps7tvoti0874bh1/xefiloromegemitabenu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18937dae40---sitoxokot.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/wizajo.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/guvugafuxu.pdfIn PDF document text
    • http://raczcsalad.hu/files/nasifojakuwowomawapokatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=middle+section+of+periodic+tablePDF 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_off0000c427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC427 10744 bytes
SHA-256: 877cc028e040ed1dc53ed455f249a0607ef67db4c9abbe22c77a4c19da6dd908
font_01_sfnt_off0000dcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB2 16636 bytes
SHA-256: 17fa9c6c1fc27b9cddc3e55cb630b4a86cc01553c4942ebc63a5abc554ef0170
font_02_sfnt_off000107a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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