Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab20e6060480013f…

MALICIOUS

PDF

77.4 KB Created: 2021-09-13 11:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f1e69183fd8f36dfaec7bf428e971f7 SHA-1: afd16422638a623c858ad64c3827104e7993dd44 SHA-256: ab20e6060480013fa56c1716f7a21befb344e49886896814c4ce49a6932860e9
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with several pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and heuristic firings strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://uptownherndon.com/uploads/files/99919327215.pdf In PDF document text
    • https://gadesign52.com/uploads/files/202109070322037156.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/kusogilesaragojazeg.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/68866165220.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/23116908137.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/43307780625.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/jigazeninarodivadewo.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16136643507fac---36778523961.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/wawedutefejazaridebapulik.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/77176256357.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/vesakurupeson.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/gokawo.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/89458888357.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/89776392298.pdfIn PDF document text
    • https://mcsfood.com/images/file/99411913011.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/tekavitexujalitatasov.pdfIn PDF document text
    • http://canoeing.by/pics/files/kitebisawobi.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109071101216385.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/914287f9e4a55030098d52af12a33745/10784088406.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/kilezimibozanig.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/68484814949.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/revokapekegaxini.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137888a1c95d---50329576252.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306c3a82a4e---84735872816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+how+to+copy+text+messagesPDF 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_off0000c897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC897 17840 bytes
SHA-256: 6869f6af373a42aae090f1348d02ea3720449f7232aee69f4a5e7cf82764d2af
font_01_sfnt_off0000f5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 11200 bytes
SHA-256: 337dfa1474c565d59b2fe785ddc8b39c76423c21b3290f03b58414d9169f4a05
font_02_sfnt_off00010fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1