Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ec816bc35b1f29…

MALICIOUS

PDF

105.7 KB Created: 2021-09-18 17:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3c0e43267113a0566e56f727086e0027 SHA-1: 0dc81e9de65753d8b38887e444a0509fb348ae60 SHA-256: a6ec816bc35b1f29a0556330024ecf79249c14ed04720085c084048b5ec8ab04
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicative of a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=don+quijote+pdf+spanish PDF link annotation
    • https://machinex-machines.com/UserFiles/File/vuvavagir.pdfIn PDF document text
    • http://esejsc.com/upload/files/sowotegobifovisub.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/pulupi.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e270e69d09df1efe8569860a9d83b45b/zesobifevo.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/gifabidavunerezetajekori.pdfIn PDF document text
    • http://ping-property.com/user_img/files/gikozix.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/181116409486.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/36589418858.pdfIn PDF document text
    • http://rubensova16.cz/files/file/14415170028.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/wolonerozirelubonil.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/66512205648.pdfIn PDF document text
    • http://aquatherm-graz.at/files/foxipekudumibitowu.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/27547923563.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0195aa7e---17724354918.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/taxobezep.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/pejaleli.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/93281318688.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/50633667056.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/4cf0c11c5eae3f4725e68b25d1ed8a6b/redamururobozufu.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/xewugobekumidizagajop.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/womejesesunatulowetibe.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/luramutipinowepub.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/webememugi.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/refama.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614457766041a---40455892691.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_off000137a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FBE 10824 bytes
SHA-256: f0b81eaf96b382c2d7007748fde09f239438879f95d8b44df40eaf043cbc6138
font_02_sfnt_off00016860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16860 18448 bytes
SHA-256: 6e53b15edf9dec39840b424af1a111606f09e824d31396850b622047e7cde6e7

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