Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff706b94eadc3e29…

MALICIOUS

PDF

87.0 KB Created: 2021-07-22 03:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b88163b17fabc40ed5dae018c566549c SHA-1: aad67e8720277b9410a72f84c7f649038e23e860 SHA-256: ff706b94eadc3e2989363017331abc79b00e2af0882523dca273e89e2d774d80
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to obscure the ultimate destination. The presence of these link farms suggests an attempt to lure users into clicking malicious links, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://szentimresiklos.hu/upload/file/68640921402.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080ce046bf05---wuzijovumibozitupaxeni.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b10555558---51056581379.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/11921527385.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fibosefujomudukazozava.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/nalerurekafegozasitapug.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/garin.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/dededetomulugukafujeten.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2f166bf2f---45829675720.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a121aa4f254---96053354441.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/fdeb589285070787e501a9f825b6c969/37406810492.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/nilakanad.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/pb88onvrqr45274b1gkppj7cdg/lububa.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/35331114084.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/5a4146d9faccae5a3c91174ef4c18229/supinixevoladusejabijivo.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/pixiwesavekejirujuxel.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/1191fc74f3d812e8de4d75ccaa0aa871/99417168847.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/78216858147.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/jaxegalulovuzuzejogoxukaz.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/10037668425.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/tamanimivilanajunoma.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/lupasovitojijowuluwujozo.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/1l32f38cekses5vjbp9p70hut0/muponowopedena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=lost+along+the+way+meaningPDF 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_off0000ee1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 10612 bytes
SHA-256: e414fa9b033c315d28748f00a11e19e93d3ff8a76d7af02b57302936e845dab7
font_01_sfnt_off00010643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E55 17772 bytes
SHA-256: cc1597c203ac9a71ddc93215c8d1573a2f30840603a51a6a7c91acc23a95e316