Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cdf7a7b09abf4a1…

MALICIOUS

PDF

78.2 KB Created: 2021-09-05 00:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 22cbc19e4c1c82d0af53382f57ec7c79 SHA-1: 12dd647dfb6cd4ae0f77ac79c4ce0fcfdbc4387e SHA-256: 7cdf7a7b09abf4a14535be6e9ebaf22c199d4997b90dec086f6fc9559f3b8e79
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, functioning as a link farm. The ML classifier strongly indicated maliciousness, and the heuristics identified the document as a link farm on disposable hosting. No scripts were extracted, but the primary attack pattern involves luring users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://eyupsifalibitkiler.com/resimler/files/23300486319.pdf In PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/52668278fe0d4e763eff23a64b28abe9/nenavepe.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210531_B36C136CA4A19BDA.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/xorusajudo.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ec65b2b74815f2d5d7f64b62dd10eaa2/dikoberubixaxik.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607994f6ac044---netekepogamaza.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/wesenadoru.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/bezifumijawaluxetedufup.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d04adcc3d2---52715504428.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/66152281563.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/warijepafazutabo.pdfIn PDF document text
    • https://inncredel.com/uploads/76836447834.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/dotojotapipuvesuwapila.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/5705526584.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3454238c81---xonudazanegemova.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607800e5bdfa2---kituwoxuwixejonasakure.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/65063894394.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/milulapodegiwuwulef.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/lufivenenipewinet.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/xitalab.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/mugakukebewukope.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0025734b---pubewowimawuxuzuxema.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/zijulexobelexiwujevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=conductivity+meter+principle+pdfPDF 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_off0000cab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB3 10764 bytes
SHA-256: 99b7d3728c3949f581edceda796486fe951128dce742799a1a0355ec15cf4894
font_01_sfnt_off0000e374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 18508 bytes
SHA-256: b72f0e7d8266c482a3cac0ea3d99d408a0af45626e6f46bda46deea1e4c47982

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