Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e8769e0550f2f7…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 13:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 306f81fba18f92664c81bc275217a900 SHA-1: 112df365b6c68792d9fb0e3a59e9f5535fb50a46 SHA-256: 80e8769e0550f2f765f88667fc50cc09e2f43e7f188dda2560660ea30b98ef4e
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous links suggests an attempt to obscure the ultimate destination or to leverage multiple compromised sites for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://razredna-nastava.net/files/vuzib.pdf In PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/ced3fdaed89525630b4db376aeeed0ed/xaxugitewibebifi.pdfIn PDF document text
    • https://isosklo.cz/uploads/ruwiferupawedimifi.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/99476819763.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/wajapuwujurazivinu.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/65518537424.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/492e09c7edeb02657ff512c6afed4faf.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee97f8b775---63899383181.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/9515417122.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/4a693ad182fffe3d5e01301586f86bdd/zekoretatazu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/93698537475.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/82582548747.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/8094831063.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/54372045186.pdfIn PDF document text
    • https://mytopics.it/uploads/file/tisozeteduxipezoboret.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/xubisemokanukifenakugaze.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c3276dfa1---80090702856.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/toxunukinanuxiwugivex.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438a6610186---84476432315.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40518676884.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/79632417914.pdfIn PDF document text
    • https://31app.com/userfiles/file/sofojovozifuzarevoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=webpage+to+pdf+apkPDF 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_off0000c1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EA 17336 bytes
SHA-256: 301395fb27966451e2b68eab736b9525db075b9658641126710edcd05228ac15
font_01_sfnt_off0000ef11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF11 10388 bytes
SHA-256: 4e5a855bb68a47ddb3b96b953d1c1040ba57c05c79d508070aa8b9e8f79ba890
font_02_sfnt_off00010653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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