Malicious PDF — malware analysis report

Static analysis result for SHA-256 290045cc2d102110…

MALICIOUS

PDF

81.5 KB Created: 2021-08-15 20:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0be1619ec9a1fd972b3987a69ced28eb SHA-1: cb89c0497bbbfb33b173233d6c87cae96e788a96 SHA-256: 290045cc2d1021104ad32ed2aa3502c196a5b07f056385bb04d7c649d5fa6bbc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports a social engineering lure to trick users into clicking these links, likely leading to a secondary payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=how+to+make+a+matching+test+in+google+forms PDF link annotation
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3f053473eb648434f442c5c4c095c8f3/18862520301.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/zufutonojoxux.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608464d0ccdeb---falefurit.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/50473707917.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/pekinovisodelizalitoreri.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/60842335431.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/zozexekixejopuwutelage.pdfIn PDF document text
    • https://diphong.com/uploads/zelomuni.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/samunigetefazefigo.pdfIn PDF document text
    • http://minhanh.com/files/jidoxamipujinesonujov.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/filixefanigigorivajiwej.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/jekokavo.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/r2ptrebp5ec40gium4hpg8k2c5/4742708264.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087c3e763eb7---89612846181.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/vubiluzodoj.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/lexug.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e48f89c40f---53788482024.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/b9a4e09f6870e0d40d586d2f33e85e8f/29918762681.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/fajavefogaxixopa.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160799eb5c44ae---kibilenuxi.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/53770552145.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/gixobafijelafuxomatutebip.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee374ee51da---90200412498.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/93903660962.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_off0000db5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 10952 bytes
SHA-256: 2ce90d0d3d6bdae0df383286ea9ac70044c68aab994595df28deb8805cb154b3
font_02_sfnt_off00010ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 16588 bytes
SHA-256: fb40742f4191b4d6a13faa08852e1d7fb26bee37fb4227f5d2efade09fe1559f

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