Malicious PDF — malware analysis report

Static analysis result for SHA-256 8881e0ed840bac09…

MALICIOUS

PDF

91.3 KB Created: 2021-08-10 04:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 769edf84b2e5920ee478305132f886ef SHA-1: 6e008e6515bee2ad82ce9a3e2f73949fd2c73dcf SHA-256: 8881e0ed840bac09a27a1e074ee4011d5b896af9727f5d3d6c03abf7211bfbb6
156 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains a large number of embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The presence of these link farms and the overall structure strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/woxewapipewajewoxokixukib.pdf In PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ses69mt7ise1lklvjv00nid2br/tamapijewesopo.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/34859913195.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd4659c16d---jonuxeno.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e13b336925a---30212714336.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990c63ad7d5---3347395204.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/27239106462.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c51c9b8491---32947314444.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/47e9d93b07cf4dfa71e8b15abb1cb1f4/93480356557.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/woxajimime.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/64231591313.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/lihondfa3cgtuvvd5hp2ojjno7/54902976977.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4bcc960f8---79200075759.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/pukajakore.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/videnelebi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57487aa66f---88441846422.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6550de9f---38805084389.pdfIn PDF document text
    • http://chpcentre.com/files/file/36126908618.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704486bb340---94089785181.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/moxorupaponegawakalefumiz.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/tezaxadigaboxid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=velocidad+del+sonido+en+el+aire+en+el+aguaPDF 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_off0000f941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF941 10516 bytes
SHA-256: 87047323e94d982ad4a16ae7af58eb044412384cb12f337f42bb4f1b0a997109
font_01_sfnt_off00011117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12929 20016 bytes
SHA-256: 3f132986048fc8034f287ab95d0830162b9e080eb0122edf3d20291b65e5019d

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