Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e307814a4a9edbc…

MALICIOUS

PDF

100.0 KB Created: 2021-06-30 02:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9b65b63f9d8f5e2f0c184ffc708fa12e SHA-1: e3f18d06a78bbb7b4e86149e9bad7149499ef5c7 SHA-256: 8e307814a4a9edbcb5c25ea0db3a85e3f4bc43351b8daf0af066841cb8f6e80a
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier and contains numerous embedded URLs, many of which point to compromised CMS upload directories. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a pattern of using these compromised sites to host or link to malicious content. The presence of a link farm suggests an attempt to distribute malware or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 5

  • 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 http://sashtraayurveda.com/ckfinder/userfiles/files/6418212100.pdf In PDF document text
    • http://helloshoppingnepal.com/userfiles/file/gunazojubobesudo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c099f2c0f---kifexodimaburis.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/6f0pl2mn5tj2hljnj7tp7895b4/34100338305.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/xetiradonubive.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/71870722898.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3b0062393---15767092102.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b1fc47c1dcdd556add226073f85ad73e/48446106284.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/6dc7631f25122e222d0ef9957d78966c/13338667510.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ccdj1c3j4t4akq4t2ldl99qno2/92313896404.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/23216671362.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4485154140e3136ed2aa79f9581f582e/58935583544.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/84275211957.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/96437781440.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad03748c7d3---89927602721.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/64919952997.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a2269717---vepazajuzapiko.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/zevereketozofumafogi.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b8fcfad1fc84ebfd1e0afad645c579ca/ditok.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/61217037697.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/51165138814.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210602182207.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/cgqt21d8jobssi1nfmddvabmb4/47638764715.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c88c4d3cc---41359499869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=i+am+grateful+to+work+with+youPDF 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_off000122ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BA 10732 bytes
SHA-256: 4706f4522769ee1ba3e4ef3c0aa58958b70dc73dd13e05507eb9addae29f0124
font_01_sfnt_off00013b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15388 17324 bytes
SHA-256: 61a5618435f94c31abd8fedfd3a923caf0067eb7decf31c4fb83b9f86d5a2883

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