Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d836633f6a6ada…

MALICIOUS

PDF

90.0 KB Created: 2021-08-12 09:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5a499d33af46700130db9d89a6f2af11 SHA-1: 82f5a83a2a975a4b458549a643863a9adb70d19a SHA-256: e1d836633f6a6ada501db123c62b6bfdae21d278f248846d2f948c19f68bc236
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=gaba+receptors+alcohol+withdrawal PDF link annotation
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6afb1e45ce---nasewifetidoj.pdfIn PDF document text
    • https://oliogalanis.com/file/xoduvovofubomomej.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/xetunewavu.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/jelisejoregokuruw.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9be0fa70a2---73344377071.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/rejolaginoti.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/fiwowopitekig.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/087c25272688b161b14e5a1014dddd65/60022455201.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/ramibujoxulojonuneteral.pdfIn PDF document text
    • http://abnicum.ru/files/file/xizotufamatik.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/b9150cce5736640e38757ab9f04dca92/33656231769.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/xaxonabapovawesekimez.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/75c262aad753d9dcd1f90cee8add822c/20511464709.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/hsst0i0n76ivf5e1c2rraqvuh0/subusaxuranen.pdfIn PDF document text
    • http://creationart.hu/files/file/80584564568.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e80f245ac3e---nijiferuvoxune.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/04613fb6ce9fedd1e5616362c08cd696/dubudefajapotadukemirum.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/kogorovisopowonusapi.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/85628196389.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a2c96de1f337be71130a33df66b77d68/wunujuzezuvorujitolozowuw.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/45c1303c4ffa68f9e242d0eb42030432/lakoxerejuzaviz.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/13976257962.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/rizevovokebujodad.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/67180490350.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_off0000f582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 19588 bytes
SHA-256: 316bdf67c9f7d991d18b5cef87beffd89dd7b9f5e1bdb843a42183b42f44cde6
font_01_sfnt_off000127e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E2 10772 bytes
SHA-256: 324fd3d880152080654570add256d662894fc3b05c860d2713449b04743f60b9
font_02_sfnt_off000140ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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