Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0cc92cdcefd932…

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 14:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0901622ba7f6b81d0dbddb48a3de1ccb SHA-1: 0ea4ec868110ce2167ef10e6f7b79fa061e665dc SHA-256: ae0cc92cdcefd9327d0f58d03ee66827d70823852a748261449406ac2a285be6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains a large number of external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=toma+de+gases+arteriales+pdf PDF link annotation
    • http://broadviewlibrary.org/uploaded_bvlib/file/28364897764.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/muvinabivabumap.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ed16c40a67d4ececb093f02b2b484421/vobodorafuxugila.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078e5be54f63---233949416.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9e61acd7233f698f9b8b52b7b8eb5a35/62318139321.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/3f461597870214de237783aaceb38d37/9893877681.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/j3mjprjdgkmcag4oqj701am1a3/45165275435.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/50lt7eb778strvg39oo4k64sul/56956893852.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0529/83b01214ce97e1fee0127ccba1a3d39e.pdfIn PDF document text
    • http://jadeite.ru/images/file/vugoremolu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609236fb49129---zesemetadamugogudivof.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/zuvike.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/levivorewo.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/0cdafb8afe46151cb8f4aae460fbb2a1/vaxud.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/de7a957018ad02efcb17092ee1e7a469/32320700867.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/660915395c0bcee6571eeb0ca3af83eb/24176776647.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/16931335883.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/52569918683.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/88637549629.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160afafcdbe8eb---35642709313.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/koxefovirig.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/6081398555.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_off0000cf97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 18364 bytes
SHA-256: cd3ef76640aae5031c517a7a08545c1acb8ac624498d203ac537a1c73767fd6e
font_02_sfnt_off00011644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11644 10700 bytes
SHA-256: 665bddd555d3ba57fdd4e986ac2ab8e3fe8354ef2d70bb37a2fad0229206bc12

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