Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3088d8a49e06e4…

MALICIOUS

PDF

75.7 KB Created: 2021-09-20 10:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 770e3ec70498c94229bbadf84ad48495 SHA-1: 8d2bf72a60baaa6d95c7add79cd0897e75d18fee SHA-256: 0a3088d8a49e06e46e4f6d667839160609d496455db2673fcaede0f209dcf894
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple external URIs and the 'link farm' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crewmak.ru/uplcv?utm_term=auto+redial+app+android PDF link annotation
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8204bb856---lumejoxatimejuxufak.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/56880363636.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/c85d192a242a5bbd2b66c35c7cbb3fe4/bowiwixoladamumog.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/54348757291.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/33259332735.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/salekesorumuzigapepalix.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210919164421_c7akb6.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/pixaxerof.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/kopexepevidigemojuwa.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/92574338530.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zinisado.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///74023778289.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/jamotemezipedi.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/29881253144.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/72288222430.pdfIn PDF document text
    • http://arablift.net/userfiles/file/78211558047.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/kuzevenukilukipunofivire.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/jigekipo.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/fuwavujofeli.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/zobepeladegewadilekofokux.pdfIn PDF document text
    • https://ienter.bg/files/sexifewipukofuwirifojasi.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/jogiloluluweg.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383881ef53d---xemitokoxezitelosedidij.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210912123506133.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_off0000c5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEC 10300 bytes
SHA-256: 5092e018ea3ef9eb9c95a51e879f1804948b5dc78b0dab3af5763abc4fda1ef7
font_02_sfnt_off0000f52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52B 17360 bytes
SHA-256: 78c1fe596a3af461f3bedacb01c6481facf9d8c20deb5019e86ef45d3b57b23c

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