Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdcab1013443d63e…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 12:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 078f7fd352ecf8d84be22e763dff57c5 SHA-1: 5e50c9c7bec7af32a9338080b38af2ebd9488b6f SHA-256: fdcab1013443d63e304b902d1ccf06b2b4ae73785932b3698ad7811dbdb8436d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URI links and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://queure.ru/uplcv?utm_term=quadratic+function+given+vertex+and+point PDF link annotation
    • http://dasbluemchen.com/bowetibovoxajesa.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/3882884647.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/rolatipugoniladunud.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16143835ba5fcc---panunuxokakozejasipifijoj.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161508fd68da0c---20966638057.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/roxogesepibavukixod.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/bakip.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/newuwamamimeput.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/jusobebadu.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/1386333117.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133e5ffb8a6a---38485902464.pdfIn PDF document text
    • https://nasikampung.info/contents/files/64003976525.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/ketigotewojegaramuj.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/15852362178.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/raxaletufakudamekurefen.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613d21bf8a3b5---53940456270.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/67320749514.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/93703127605.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153be705a63e---87512525369.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/49833797085.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/bifonoxafurer.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/wugenujivuzawarotagolol.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/dalog.pdfIn PDF document text
    • http://kalbaninc.com/userfiles/file/98932959119.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_off0000b0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F7 14744 bytes
SHA-256: 67679c908ec631ec69919821b83dcca72d0688cd2d26e4ca6b79bb872cf56efe
font_01_sfnt_off0000d5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F5 10908 bytes
SHA-256: 251e71508bd931bc5c77e955abd7621a458187a82b4ecc6bbbe23b8731592cb2
font_02_sfnt_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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