Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9138a6fd0d542c…

MALICIOUS

PDF

98.3 KB Created: 2021-09-01 14:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 79b3524dfb22e913c8afdcee15cf8a59 SHA-1: e5de1306ba4b07f66a9a8d33874f931ea460b949 SHA-256: 1f9138a6fd0d542c86117874e18100b8afeda3b0af72bf4ddc654d486d6bc521
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and exhibits multiple heuristics related to compromised CMS uploads and link farms. The presence of numerous links, including one to a potentially algorithmically generated URL, suggests a phishing or malware distribution attempt. While no scripts were directly extracted, the overall structure and heuristic firings point towards a malicious document designed to redirect users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e5c06dd1a89---36909525974.pdf In PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/e3ko6tg5akhp1sbrlf0cup0a2e/rupagixunukaveraka.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/913a39ebb5339cd078b2c52fff690665/77798178823.pdfIn PDF document text
    • https://samudra99.com/contents//files/18658821233.pdfIn PDF document text
    • http://dakmet.pl/upload/damezib.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/69100876417.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/72ff9ed704e6f7605540b302d8e31943/podalekogubenej.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877e28bdf80---38225485916.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/54326034654.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/38046750198.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/3bbd81912587ea66b604197b5fa4de43/36927136751.pdfIn PDF document text
    • https://bataretak.com/img/files/file/xetoko.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210606_7F3C099F0E2070BC.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/o66kms2q4rrgbdbftfll1a4dq4/98000841756.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160795085a60c6---87239234925.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/5738508571.pdfIn PDF document text
    • http://1careglobal.com/upload/files/41548857390.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/lugolunobup.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/43505059105.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ac9871e31c0d950a99cf2f2e11fdeb1a/39575499789.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d04adcc3d2---52715504428.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/11467751677.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608828629008b---812445617.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/62af22020391bc9ad607d1080b50a435/94931713449.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160844716a43e2---63126045802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=trident+refit+facility+jobsPDF 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_off00011b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9E 10816 bytes
SHA-256: 7904cd1725395f4f523abd384287bc60d89850b7ca7756fa6de45ff7f707a085
font_01_sfnt_off000134ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBE 18072 bytes
SHA-256: 1acb0b4bfedd68c236ebe519b3d06f13a4092a2ab7f5c3682320b64b7f3da991

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