Malicious PDF — malware analysis report

Static analysis result for SHA-256 69718b2554130b08…

MALICIOUS

PDF

85.4 KB Created: 2021-09-05 21:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ed127d250c720f2c2f3696f6394ad0b SHA-1: d9b88ba9ce2f9198d4c0126c38274019ed7eb00c SHA-256: 69718b2554130b0866f0758fccb421913e3ed120721b6ce9ba760c46497bc52b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the nature of the URLs and the overall detection suggest it's likely used as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pixomot.ru/uplcv?utm_term=family+members+vocabulary+worksheet PDF link annotation
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2fce183aa7019756b50b46b262c2559f/nolavifajapefaxabefitas.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/pozoxasa.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/42627123716.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/36426550357.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/bolanofade.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/66493214058.pdfIn PDF document text
    • http://harperfamilyreunion.net/clients/3/35/3566a42c83b0accea4ba2bdfee5c7976/File/kijegodido.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/ded8df8bc3c7c7fe1c5b59eef8efb1a7.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050909343773499.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/2ada5325182d9810715fb04303f9b02e/kelafefaniz.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/9d88eafb3daf3f9967edc92e4b89fc6a/jalage.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/kedixuvozaraporuduneb.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/dabomejadog.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/vazodilijodufopewola.pdfIn PDF document text
    • http://tavio.su/files/file/perasigevupaniduxebalovet.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/90804603721.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/59632118176.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/vebowuxadotokopajoseg.pdfIn PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/taxabaxulosalosof.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d94a0de1b3---92785590394.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16106a4dcaad95---53803346856.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b4602550c2---vavelaramimuwewusiv.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_off0000e540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 10968 bytes
SHA-256: 83c2a4b79500ba937669507fe16c982fded830b50bd3e9f6e1446d472b611de5
font_02_sfnt_off000116dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DC 19260 bytes
SHA-256: aaf53bc17eefa00b758c6bb2f69597a8247a6db363e2c2a356f6a545e7c697b6

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