Malicious PDF — malware analysis report

Static analysis result for SHA-256 110f0a59afc853ca…

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 16:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ac497b9970b3259c19cde2d5c74d8e9 SHA-1: d1f84859714c353f11695a883501ff939b9b1d6c SHA-256: 110f0a59afc853ca4015aabac9c0277ae031ab2a47d6e48b4d2cdb6c7da527b4
164 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://neuchina.org/userfiles/file/12830783148.pdf In PDF document text
    • http://smolninskayahotel.com/userfiles/file/tozoxexikotiwo.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/11801870181.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/lirum.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/kowajatuje.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9c1ca55fd---3269349320.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/20330043901.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/2255c6712b15b796a4898dfe169d87d9/86750504647.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/fovotesejozobufodovu.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/ginanokufaguse.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/20/file/20210920_102623_194.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/wakoso.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/72961717708.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/lojipos.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/laxuxefinuzamonivejivi.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/32202654670.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/jolebemu.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/25090797726.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/46682645980.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/muxadometaxane.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/73819398548.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/luguro.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/xusowuza.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ld2iuve9m7unogc6ldl70teul6/24703590357.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/koledozowowilafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fs+explorer+file+selector+apkPDF 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_off0000b3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF2 17676 bytes
SHA-256: 8406b194545798a8e36afb1ddb14db9d9c01b9c95411f358063bac9464c195c9
font_02_sfnt_off0000f8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A4 10540 bytes
SHA-256: 2167609beda85e90b579b9dcf408fbc0f6abf321f59db834ca639f2e85beeae8

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