Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa6f4bfd364afd8…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 09:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 10e3b047c2dd8ee1f11d88339b081c97 SHA-1: f4b0ee915adb1b5580a59fac26c2b769998bdeeb SHA-256: 3fa6f4bfd364afd8fe0f3ad1f2f01356c5951e95029fbb59395ce2e38835bb0f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further compromise or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=swype+dragon+keyboard PDF link annotation
    • https://newchat.xyz/js/ckfinder/userfiles/files/majodanugosed.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/45651055433.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210908_113756.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/47733287132.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/39582626011.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/91486816874.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/wafivirunej.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/185224700.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/84210450244.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/wezogesate.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/70262895504.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/73024185242.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/zefufivilo.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/21917703431.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/7c4c1daec615e14f5359b0ddc0345361/84557523751.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s8vg0prj4d0s5oh4uc9042ntn1/85108160289.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/65933146953.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/19262308081.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/zosebarukupasojozuv.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/lapukudop.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613194e19096b---bagewugusegulifex.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/bc72c362a62b6905385ad764e5bdb051/movugeveluz.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210916_AD8159CBFCED0A86.pdfIn PDF document text
    • http://baove24h.info/upload/files/badafinezekifafax.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_off0000da1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1E 10668 bytes
SHA-256: bbf03e28873826d5b279cf45c00eba91fd2028f4753046a3154a87910fad9ef3
font_01_sfnt_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 18552 bytes
SHA-256: 35545aade243ad9463c9d58a4e517e388d9a3d519ba543da452ce33ee61d5ba7
font_02_sfnt_off0001230d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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