Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a2217e9dd81f9a…

MALICIOUS

PDF

108.5 KB Created: 2021-07-01 13:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fde2297532bf18267548c247208e6e54 SHA-1: 8801f3d154bed7163aa2cec83adb3fb6b47acc9d SHA-256: a3a2217e9dd81f9a7fc0e19131145d76d22b22f3cc8d6ae4f358113cfa860502
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. No scripts were extracted, but the presence of external URIs and the 'link farm' heuristic strongly suggest an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=clothe+yourself+with+humility+verse PDF link annotation
    • https://skinrepublic.vn/webroot/img/files/ludozaraga.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16079381285b42---43623691354.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00efd6b7cf---26014043454.pdfIn PDF document text
    • https://migger.dk/userimages/file/noralibudenawozis.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/0d774f85f3835dec8ae9c8bbab2aa502/mofusaminosuxogipalif.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/560884c798471c7038e198b5891545e2/lutugazudotujo.pdfIn PDF document text
    • http://abnicum.com/files/file/jexujiki.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7ab4d6392---94772904131.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b77409c5563---ninaritagemazuratipaxovi.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/35334100220.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55781099941.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/031cf3d48ff5b3705b64676f4b80a53c/xudiwa.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad1e59cf27---32501936446.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/forogavomuxemipisukamib.pdfIn PDF document text
    • https://bnovum.hu/downloads/pewulixegokififow.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/6833757667.pdfIn PDF document text
    • http://dnepropress.net/files/file/37005177867.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ek0bpvnctd216o3dih9pa9fd7o/27982506417.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/kuragixe.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec68bc2719---17531669193.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/dhf12li6fakhv8fcipjecq821b/wowan.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/2295ac19c0878e7dc50d13398cb6c1d7/zolewobuxekemijenag.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_off00013bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDD 23288 bytes
SHA-256: d729fb4d20ffecfe3658ac3ba70975f6191203d797b638a44bee12efa5edd7d0
font_01_sfnt_off00017471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C88 10608 bytes
SHA-256: 8daf2e6d107d8662b4a8daf647420e84c343357d05da2fdf1359354cffd53a39

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