Malicious PDF — malware analysis report

Static analysis result for SHA-256 73260f431992bdce…

MALICIOUS

PDF

94.5 KB Created: 2021-06-26 04:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f4385ac58e636415c15e31e4484c8e1 SHA-1: 87d2efc413fc5d7bb86d60d52a64de481c0ab364 SHA-256: 73260f431992bdce7493c42868efe0650511abea52c8a25bf0e3f02e1139eb45
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farm indicators points towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db85a06064---86662455521.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/886a2ff1d70278bac0dd9c5b097aa4b3/3925156848.pdf
    • http://dgjst.com/upfile/file/zazizepejugovi.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160888eb6567b1---vegufopifefitug.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a88818b92---86496624987.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/9umlr84ldvlu5m7jli44drr486/76020304508.pdf
    • http://bigxra.com/uploadfile/file/2021062005174573499.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c629f63f359---98562582039.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/e6588a5fc9e968382f9d7e79f844d67f/37827929504.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f753acc2b2---vidoliwapevekejibit.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/0975d7a008283580838514f8ed8ef557/dojexewetovoretovo.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/dazelabivolarogofolob.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d0c0a5c0a63a7c00ed88b1606f9d0ee3/22252133861.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a0e39aafd333025beb40e85dd6f4fb2f/bevuzafaketavunepalalem.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160863b163f3a7---97686369633.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160737472a8819---29429959832.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/88836771ed06fd8beb2b7d0c7cb75c64/8084568512.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8ed31707e9a582a2e12810dccb397859/81994953645.pdf
    • http://coffee33.ru/archive/file/vovesifoxore.pdf
    • http://juha.be/_files/file/19629257856.pdf
    • http://candientuvibra.com/images/file/62372102195.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/71953605149.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bef55b697d1---34460184658.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2de2bd5fcd---52569865783.pdf
    • http://biblioteka-belzec.pl/upload/files/90976116430.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=types+of+non+executive+directors
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e98.bin
1f37bdc06748881ae389b1545a9c58633776f956ade1271c16b0c288fb9e21eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E98 10752 bytes
font_01_sfnt_off0001278d.bin
f9c336a46fecfaa02a08c9dfe9b537f15abbc426e4193d29ab8e349448de62f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1278D 17244 bytes
font_02_sfnt_off00015496.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15496 16792 bytes

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