Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b22d4930e8169c2…

MALICIOUS

PDF

86.0 KB Created: 2021-07-17 01:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 32b321a7cb784c66a31bc57e80c27718 SHA-1: c4ec1703c5fc34711400969c2facb9ab27046122 SHA-256: 2b22d4930e8169c245866bc0d2926b14216b7f4c60f74673720f491651e51364
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. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a789cf2c02c---1309217469.pdf In PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/bf8efc1965f245db72e9eefb4d42d567/47840462789.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7887ab3290f198bcb0cc4c56a7587af5/parafidobiz.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/motefirenixiruzitun.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/82657707666.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/35711194886.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/79569210316.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/tojiloxatalijikod.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3d246d7f3618bda05b2fc26f80220ae6/55948973478.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/24149580668.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/85929438100.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/47993559305.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/7cd87ad792ce613d94507a6a93803f16/nuwonumidejum.pdfIn PDF document text
    • http://novichiha.ru/pic/file/6874824567.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607642684ff76---45054742785.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836996d7f3e---19935802286.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/68800279932.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e9211453a1c---32412099895.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/bokeluseregepuju.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d81c4189d8990eaa2d485f276736d429/wozegugewu.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/416c58a73b20cba684e025a10d4178f5/darawutimurefuruwapukuz.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeef8c88bb---duzejeguwira.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/2effb26567fc0d41078f5b66735e7c18/zekew.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160810425c92b8---seviropumipu.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/qej1std91fr87qbtklbfmn4tkq/25575080116.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b1d1503330195a09503378eec77dda87/kazofumak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=class+7+chapter+3+civics+question+answerPDF 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_off0000e84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 11120 bytes
SHA-256: 5971820b25cd684e456e524b057612b766bad2aa929b0a232b6233777a47c245
font_02_sfnt_off00011a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A71 18332 bytes
SHA-256: 0cd285c28dcd44e6164e18e79c086216ee7bc34c96bb58d35e33a35d21cd2355