Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3ed97c36604d71…

MALICIOUS

PDF

79.6 KB Created: 2021-07-30 23:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 01f280262a7add5447747b2b0f7e7cfc SHA-1: c21f8df7ecda98fc441bf9fcd80a203c418030fb SHA-256: ac3ed97c36604d713c31f5af09d2ac047c5cc2b921674d9920116e95a8be1e40
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://brianhigbielaw.com/UserFiles/file/lasurovubanofup.pdf In PDF document text
    • http://utuin.net/files/fckeditor/file/tigafexaburalupifijulaxir.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c60c9fad08c---semuzi.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/hshboecfucg6u7oic5naoftml1/kegedosofediragisarita.pdfIn PDF document text
    • http://sport-way.ru/img/file/witaxazejus.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/20343767020.pdfIn PDF document text
    • https://vestol.bg/files/file/mitogusimidajapob.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/7194d7ebcc161d312fe2b0b6a7211532/lewubasiburevivorimosiva.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/b3cr1qujsbg2tkhhdpjjeulbn3/63794554572.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c796a0953a---xowemivefutapo.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/38736044003.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/33681842040.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/vixilebemuwa.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/89440800578.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5fe781b9016922f79a985314138fd2a6/44539953721.pdfIn PDF document text
    • http://effektfilm.de/files/file/sunegu.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/xemojutigarip.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210531101334.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b53856ed2ed---43174032891.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16094478e45007---67083073611.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/muvijolilupojilazepewo.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/26036316781.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/56bd5f9d487a63c2daf95124e6bbd96a/97487806362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cronicas+del+angel+gris+alejandro+dolina+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_off0000d147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD147 10856 bytes
SHA-256: 30e7d46338f07b82b072639191bc2442cb33911afad070ef69f955ed4dbd5ff2
font_01_sfnt_off0000ea2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2E 18288 bytes
SHA-256: f5e908e39367cdd058bd1bc0d9589718d4ed2ca18702b1d4f3b21f130b69f42d
font_02_sfnt_off000118b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1