Malicious PDF — malware analysis report

Static analysis result for SHA-256 8870bcf1cb9b931f…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 12:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a1a51f33e027185d69c85fe2c7953145 SHA-1: b00d112362d6b286e3d45c8335c14e453ae8cf3a SHA-256: 8870bcf1cb9b931f50904d7e1ec504587a54ac7787e7dcd6667031973988c3b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection or download of a secondary payload, contributing to the phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://lufty.cz/UserFiles/files/mujevowi.pdf In PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/95304491285.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/potiwefololoxaravolapete.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210905085753.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/rafivat.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149f3e850993---29389571238.pdfIn PDF document text
    • https://atavio.ru/files/file/rokedulirimenakanekar.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/famuvutipunekitekeran.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/gubazaruba.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c08851d5c5---varago.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/nipifozikepakipidem.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/xaruxomotamozajazodofup.pdfIn PDF document text
    • http://asqcert.net/files/files/72172636639.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/98063964903.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/bexetubitutiwazosib.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/42115663041.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/32006429179.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613151604c8d0---bolovigudomoxarinawid.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/tolom.pdfIn PDF document text
    • http://bdnchem.com/upload/files/fulobeleb.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/56544228915.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/26258985853.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/35642363258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=watch+cruella+online+free+123moviesPDF 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_off0000ad4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4A 14716 bytes
SHA-256: a4754cf553052e36ea876f26289aeb150cdbf0683b0bcaf5d1a2c39b2299d98e
font_01_sfnt_off0000d1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D1 11104 bytes
SHA-256: e4c5142ff724f8aebc941deed3efb6e85840ac66f9d3a893be7e7fdd369bbe41

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