Malicious PDF — malware analysis report

Static analysis result for SHA-256 023256aa0b26ff18…

MALICIOUS

PDF

89.5 KB Created: 2021-08-30 13:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b73ca414ff9d8eb948e90d39f2ed3fe7 SHA-1: 056a8a64c708c34bd23098852d663df6e38e1831 SHA-256: 023256aa0b26ff18831382bf35291f696ed3d7d29d208fdcc1554cfa05eadbba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the download of a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=icse+books+for+class+1+pdf+download PDF link annotation
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/9a26d26df854bb44820ef512386a8307/7077511503.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/tipasawu.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/sojefipakivemexopawiba.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/27d677bc3675cac29234ae025fc9a3b8/vosipuxabezej.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/6969801231.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24bac70e1d---xujizukemun.pdfIn PDF document text
    • https://www.cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/63431280029.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/17028983031.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b30d8567a---xavolonirumajitegitobi.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/651602546.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/vaweviredutakero.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/xanazoderezufizebenajez.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/zanomajesu.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/bokupinel.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094203d1eb33---wanekeza.pdfIn PDF document text
    • http://3q1p.com/upload/file/210630090935484376uhi3foeag30l.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/60889173218.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/kakofupanugawobi.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/9c5lkd3k39k5tlug10b29r8ja4/ziwanozujarefiv.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/gobigudi.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/tevoxulemovofubodakexew.pdfIn PDF document text
    • http://spc1962reunion.com/clients/c/c5/c535eb5d361035e84cedf1152ec4da8f/File/vimufeset.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/47462213390.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/nubesuv.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_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 10744 bytes
SHA-256: 7f3ae309addd2f87213ae465432cd6b13c77e4ef9624e98bad59aaf0833065e0
font_01_sfnt_off0001089a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AC 20680 bytes
SHA-256: 9e153bfc4617836a9aea9085f97d78e7b5fcd5df3917e7ffcf26e66ea7360371

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