Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f9ac7cb67df49f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 05:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2dae4301ba3881f1098ab31c91e1954e SHA-1: 9b751a68ebd04612e02141bc0e9c499df4e628b7 SHA-256: 45f9ac7cb67df49f18407baac8f2dd6911ad8771a7b395dbb783a76f8edd3643
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm hosted on compromised WordPress sites suggests an attempt to redirect users to malicious content or phishing sites. The document body is heavily obfuscated and appears to be non-readable content, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b290e91ca8b8cde60bc0c4075c727e84/20695586009.pdf In PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf22a67243---73260104340.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/14172736c4141cfd6d0c23657c45c616/kivanunuz.pdfIn PDF document text
    • http://kesifveotesi.com/files/83659170957.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/f642013f8bfa1dd8831c9daac373b03b/vupukuz.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/7d61970b196ce10dde5ca8103d93b523/61209399827.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/20541543900.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/pesizopefametudowexot.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/1942261702.pdfIn PDF document text
    • https://esz.jp/img/editor/files/doluranulasifubikokeb.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/dagesolovipesamogotoravix.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/21276832563.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/lukapamabidapowarasade.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/74345258937.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/rewixemijopapo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c308faf37d---72398678828.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8b4f9e357---64285239695.pdfIn PDF document text
    • https://12shio2.com/contents/files/kijorux.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/mokisixogonomog.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/1239061aced98698ba050041c0e535ba/26561195025.pdfIn PDF document text
    • http://soupworld.de/upload/file/juwupubasuno.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/bunaxugizapegamofuw.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84ad2b895---4543151323.pdfIn PDF document text
    • http://bucketdiaries.com/uploads/files/rizepusebitazimakepazi.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/67449485730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=fluke+12b+multimeter+user+manualPDF 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_off0000dad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD2 10628 bytes
SHA-256: d6c0522c43f811b4853941301b06b919269ca69961fcfaf999673758444682af
font_01_sfnt_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 17672 bytes
SHA-256: b0bfa5866555bec671798b7616117736415de0745010a78b0198ef8d464400a6
font_02_sfnt_off00012051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1