Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c4a906509d770e…

MALICIOUS

PDF

75.9 KB Created: 2021-09-11 23:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 56fa555d5713b18608abfac5f91f1e99 SHA-1: 224c40eee26352172ef651c79a7e24e8e88ce15d SHA-256: e1c4a906509d770ec6b2ddeff8981655780b2527bcfaa7cb859dadb1b90fedb0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/66641552902.pdf In PDF document text
    • http://pokemom2.com/uploads/files/sugoduranuzegozu.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/77080330680.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613577cb7ea49---53208014486.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/bowezonewapivenifi.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/5459143644.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/32539182100.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/razagosedajazijad.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/86294490710.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/linuzatenepakopisinazu.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/5f15f3c80e35fad27ef05820ee74d01e/lujigudagexol.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/74506523757.pdfIn PDF document text
    • http://btfa.tw/upload/files/fabujijewegobazerini.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/tokogixow.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109041447155966.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613667ae6ddb2---naxusafava.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/vafelomuzavitix.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/zovedapotuseza.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/divilevebujutunuma.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/43712891227.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/mutisomonavurixe.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/wupanitixegibuwi.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/savasejavuligenatelagabi.pdfIn PDF document text
    • https://afma.pt/site/upload/file/8580927202.pdfIn PDF document text
    • http://goref.ru/files/file/siwamolazolopokoruj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=redmi+9+prime+miui+versionPDF 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_off0000c254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA66 18312 bytes
SHA-256: 8a54d42b8fa4f26914c65360f12b06ef39c2fd6382f3c9702158cd27ddf4480f
font_02_sfnt_off000109e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 10624 bytes
SHA-256: 064f59e265d20f31b224602bbfc989efb08fb193e4cc1dbd045c073008251a62