Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9420c1b7c5e3a9b…

MALICIOUS

PDF

85.8 KB Created: 2021-09-23 21:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 968288d6394734f010d94eba24f97084 SHA-1: 01e79722ce124cc741616b0a205e4b93154983b6 SHA-256: e9420c1b7c5e3a9bc8def62a8be44058ab934fd1d04bf38da89e7ed8b71e58fd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of embedded links, many of which lead to compromised or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of a QR code lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pixomot.ru/uplcv?utm_term=pokego%2B%2B+android+2020 PDF link annotation
    • http://www.rannatennis.ee/data/upfiles/files/57021661376.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/28358695626.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/togutozamalojew.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/runutaf.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/kopulilep.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/minakugalumadazotegow.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133709272033---wubejapenidituzidot.pdfIn PDF document text
    • https://svltv.in/userfiles/files/56930779722.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14337610357.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161421924a2126---kerofexixu.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/dubazarukudutepuxovumowub.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/wobezejepo.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/dezipexidito.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/35488613425.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/1651507345.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/viluxowavawik.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/35655354575.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/vekidepewivuso.pdfIn PDF document text
    • http://pronobile.de/catalog/file/63806348688.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16149828f6708a---89250204488.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8986c5ee---93963767621.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/54342007f7c4916eb1ff1218de232931/97493413270.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/kopodosuletorusonexetewo.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/tivexofurudexoguxoxew.pdfIn PDF document text
    • https://basisangka.com/contents/files/28307100587.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/gelawabamagakasixonoze.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_off0000ec44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 10448 bytes
SHA-256: af3832c8b43a5d280ef5ba426b0d9554eb97e04defccb0434aa6b5f3ebb48b4a
font_01_sfnt_off000103e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF9 17844 bytes
SHA-256: fd2e0dfb986ac8d4eb5115adc78d5d6b3e15206f14e6fc98f3628269a2935d47

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