Malicious PDF — malware analysis report

Static analysis result for SHA-256 e242a4896c35d751…

MALICIOUS

PDF

79.4 KB Created: 2021-08-21 07:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 70b6b9a3a914c9605b0762ac5acd992a SHA-1: 0c09aac1dcbea39a9ac2d966ef02e946cb48877d SHA-256: e242a4896c35d751ed2fa552c12cb282a4ee1377970df22d6c3a0ce74238e041
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The document body is unreadable, but the presence of many external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest its purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=why+does+my+fire+alarm+keep+blinking+red PDF link annotation
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/3kqfllik899e0avkhit8rt2m03/53733679874.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/fv7dhdufhkojt59m5ihpjqret4/dijemazijimawejorutezuxo.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/45028266679.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3e8438531---96594663247.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/86521956507.pdfIn PDF document text
    • https://taperagi.com/contents//files/faxojagobabip.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/jitegit.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/nunivoseraw.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d04dfc5a826---pajubipapi.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/bemadanas.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/r8j3fdhs0thmabclg4d1bq52qd/lobap.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/f9sgcrhafcs7a4hq3l6ntv8n1l/daganokiwapawuberaz.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/6ae9e01eab13c6a20b6a9c1cdcc5095e/8361513033.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/p5budqdp60gcfj38ct52h4bulr/68385960981.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/237imaivt2dpoqh87624nkj4c5/5524775684.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/44a800a73aea973c80c39f8b6c4b0b81/nezirirewuretar.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091c7718a084---27428313868.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7ff85irnogig4v0dceuepb5od6/29174609447.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/vezag.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/77040753628.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/87802631803.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/83044847352.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/pekufewofi.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/48897590381.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_off0000d3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 11188 bytes
SHA-256: a3087749eabcc9d7da7463ff5f086d1c716a5f510b5efa0a1d7752e0ff8a30cd
font_02_sfnt_off00010545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10545 16364 bytes
SHA-256: 34dda3b4d70206c0cf238710883880a14aaafd2c7ef53b8e34e6ba636f15bd91

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