Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b2cd673cced560…

MALICIOUS

PDF

82.3 KB Created: 2021-09-22 19:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8170db5d238f9fe3f76c0fa27ec00e06 SHA-1: 17f67566d60b9e6d97cdef309bc266e7745ee5a6 SHA-256: d8b2cd673cced5600294358116241d5bf25303264f3d09be762bc0dea5891230
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://hatinhjobs.com/upload/files/bugigenopowi.pdf In PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/delepixow.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/82712612190.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210919_165712_196.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/93854624247.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/20159322158.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/kujavipituderupar.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/napijaguwotuzevegofo.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/65773262057.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/21768666219.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/vipojuzakejibaden.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/6679484009.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/xisililoropuvijakekevaza.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/58325175963.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/20945118585.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7c753616---dedegiv.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/4sqi7tihr1sdji9u3obr52bvd2/6103369159.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/zatil.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/69764845321.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/16766219684.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/55bd6c497ddf4e9aa533630350f72adc/57692087967.pdfIn PDF document text
    • http://ecole.ru/text/images/file/20890419473.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/xunuzakokifulebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=best+fm+transmitter+app+for+androidPDF 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_off0000de04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE04 10664 bytes
SHA-256: a4c03405a01eadc861a6190690fad9e5a9b7bce2ab8cbc11f08465028f51fdd3
font_01_sfnt_off0000f672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E84 17320 bytes
SHA-256: 711813b2b3bc24e5861644e86c9f036760df67e7c38d638d7731f055c3346035