Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb2399239b31f5c…

MALICIOUS

PDF

84.6 KB Created: 2021-07-03 10:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0a60ca9fd40481c72af307987352f2c1 SHA-1: cf871c34355d940153b6410a63f26054d562e204 SHA-256: 1bb2399239b31f5cb3fc94217348b4f3cf8866bf2a2e1ead6be46978f80a21a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate effort to obscure the true destination or purpose of these links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nomylo.ru/uplcv?utm_term=as+above+so+below+occult PDF link annotation
    • http://ateliergermain.net/sites/default/files/file/nuzewabadiradimevawovukit.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/kenutinapixipelopovul.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/pifatubiwibepavipa.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210606120625.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/59956039277.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/joluwixixibejabube.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/64141831492.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/nogogupu.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607360c6baec2---31537068858.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87e90eb345---17440807469.pdfIn PDF document text
    • http://kalikraft.com/images/file/pexagepekatovogatexefedez.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/35d9beaeb302ad63ba3a79b8706c53a9/xekob.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/tajasofurapifaxikuxefenu.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/l90j854nroda0dia09i3o1sql0/wijarugajewilatimumuz.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/56720661461.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/sunoxede.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc5f40be80---63473811193.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210703123653.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/81833189680.pdfIn PDF document text
    • http://bjjiffy.com/upload/rugulirafevejesidometeraj.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/2ccf2ca977a8a9912b36bbe6f8a9e71a/21383844549.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ln5enprpel7ackq5vooe7knd2l/63000301012.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_off0000e4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BD 19096 bytes
SHA-256: eeb402a006f81175c82cade180cb24469aace18ebcd1125069d67563622a1ad8
font_01_sfnt_off000115d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DED 10300 bytes
SHA-256: 013ab073922fc6baed6fc25f89277015876c5392aba72289ea9d5f59523bcc92