Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5101ca6f8e57f3b…

MALICIOUS

PDF

86.2 KB Created: 2021-09-14 11:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd7f559f0a0bb145c9be845b334ce68e SHA-1: ff8800330bb35157c1dccc83ccf54940a098953c SHA-256: d5101ca6f8e57f3bc0eb7166406fabc96509ea2f56e65d12c27d701fa023292c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. The presence of these links suggests an attempt to direct users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/31024ab49d93a064872a4f70f236d9ec/rabeniluluxevulikigozan.pdf In PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/pusuxesurujumufuk.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/mukakej.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/rojoxupepu.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/zifejigawijami.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/gajiwawenilimaxuto.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/82000269594.pdfIn PDF document text
    • http://sjanzee.nl/file/34443174860.pdfIn PDF document text
    • https://primer-spb.ru/files/files/revonanerugedalire.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161370dc2bf43e---21866035715.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/selefokiriwesogimoxoni.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/fekexaxugapopekipivojorav.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/21861446818.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161362f6f568fa---89651210627.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa12c6b9ea---wejivipugiwaloja.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/69365032143.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0c0ce18b3c94d920cf7a151672fcebec/9400271885.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/14830601615.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161405e102caaa---dejuzapamugil.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/pedegaxikutugotiguretige.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/sabemasivafinogiz.pdfIn PDF document text
    • http://raczcsalad.hu/files/mulogijiberiro.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138518fe9dcb---ladudobuxo.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/490859706.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/7106787249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=danger+dash+mod+apk+android+1PDF 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_off0000dfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE7 10840 bytes
SHA-256: a918911a626cdd4bd4c5f74eaeda5fc4c118c5759ad7108be97a94fc96f917dd
font_01_sfnt_off0000f87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 21292 bytes
SHA-256: 9aee870969144e82bf6ca6bb379548461f830eb6e6471735cf89e3b3b52bd975
font_02_sfnt_off00013146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1