Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdee1c2dfefba2bc…

MALICIOUS

PDF

76.8 KB Created: 2021-09-01 09:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78092d194998ddf99a75d55f58a936f5 SHA-1: acb0b80844a69e7c8d9eadb547e3185beb72fd1f SHA-256: fdee1c2dfefba2bcc245f397145c2b06ed360cd12e57d4d5ca301b19dfbed15f
156 Risk Score

Malware Insights

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

This PDF 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 compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://dlzj.net/upload/files/20210728000214462973.pdf In PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88a7916b3---63241914134.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/94874719940.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81bc309618f8dd8e17f94b325e57eeaf/18029780904.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/httos70avlcs5ac277kv7mmies/15258116448.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/90148271892.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3cb614a8f---jumagovowafilowuso.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/pisos.pdfIn PDF document text
    • http://20thhelicoptersquadronreunion.com/clients/71358/File/49530921256.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/65346216569.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/43603838685.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609ead6ddb8eb---96399884096.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/mexomuxuxibarorovobej.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/96764812911.pdfIn PDF document text
    • http://ellerbeefamilyreunion.com/clients/874543/File/nudiwarigaboxutexagiroke.pdfIn PDF document text
    • https://successalpha.team/upload/files/65052932241.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/4051269133.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9c2fe39ae---13945466655.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/ropifinuw.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160731c83c6f97---kafurerewiredakupuxiwim.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/zudadaled.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098cc9ddd66e---97236589873.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e82df45b223---10594579897.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4853cad18---82461398972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=index+of+cardPDF 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_off0000ca53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA53 10120 bytes
SHA-256: a093235db5f98a3cb9285c7eef333d6b6b2f17dff00b6afcb9c7b0c5e69a398f
font_01_sfnt_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 17452 bytes
SHA-256: 3ea1f1075a632c12e57272911965a0acac17eb31b198ccc624f22b686cdeb028

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