Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a5831c88e50165…

MALICIOUS

PDF

77.6 KB Created: 2021-08-27 11:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7403e29c7b21cc2ee406f30e7bde4831 SHA-1: 089e3474c9be8b8fe1f7b8d88fde934ffda1376e SHA-256: b0a5831c88e50165a7c32e63fd442c46c19f2d6075e3d0c9828c48d3d3a2db91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern. No scripts were extracted, but the PDF structure and linked URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=me8501+metrology+and+measurements PDF link annotation
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/0a057fada6aae82a150bee191732c629/vogagiruma.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160807c37a4f6d---20112572125.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/78484805495.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/29881226326.pdfIn PDF document text
    • https://hoongnau.com/upload/files/pilotawexakaputexid.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/35133858954.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b09e97ce87---nadapozitobeno.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/87780078664.pdfIn PDF document text
    • http://laduses.nl/image/file/jilixe.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/28593072716.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/72914386061.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/89364394244.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/58044380588.pdfIn PDF document text
    • http://uhli-janmaria.cz/userfiles/file/gakafonefavubonadegu.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/bitigusijat.pdfIn PDF document text
    • http://mariancozma.com/_user/file/buvokobufetesomofo.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/rixizodirat.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/feniruvogaxepomub.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/durizifafuvebe.pdfIn PDF document text
    • http://banquat.com/userfiles/files/giwilakebagikedadononisu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f990a9bae---88282140373.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbe7a704c3---4838483889.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a979deced62---nutodigojipojewenoko.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/4e427bcf8e6b2271a14e8d79da8ea886/lumagapixozafujok.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_off0000c9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C8 16836 bytes
SHA-256: acba74bc3b201493f78331731c576027f03f78846819ace7643cdcc0d58baa69
font_01_sfnt_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 11224 bytes
SHA-256: 5da332efeb37a3b2a0564c7843947bdc4bf9a601070923456ac7989690094458
font_02_sfnt_off00010fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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