Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d6c2469efdb986…

MALICIOUS

PDF

91.0 KB Created: 2021-07-04 16:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cfbe4d5de00923c04b2bdb8c24adf631 SHA-1: 298a077b29590adc9ca65e3f72035434ace85fd9 SHA-256: 23d6c2469efdb986a11634d11e92c420aaacd5ea312f04575bb953504538493e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting. This structure is commonly used to distribute phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://apsencollege.org/test/fckeditor/file/16796957380.pdf In PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/9g1fp9tua2ch2c4rng3v14omtu/dajuvirukuzize.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/c9fc7563e6d311a5ed31563f92ba71ad/xexulisag.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/rukomedakiparo.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/bukukoxakuvajabojewisa.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/desasedewajonarodabo.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/bifopen.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc2c1aaeb3---zuxilewabovazezogeja.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/98945135130.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/51463909221.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/ba5fde19dfcd5608008db42d2b3aee9d/zuziw.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/7abf12781928bf121885f3b2a878a80a/fewusedilivozax.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d967f264f---30287236724.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b802d19bc2f---47481800380.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/11116537073.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/36f4baa5a8874d5d63ec4f262c0dd72c/namamarom.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/dogumodugawegesu.pdfIn PDF document text
    • https://kildevangen.dk/files/mizeximelupopubopaviz.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/kegapuxibomidofizofajema.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc6164355b---lunakaxilez.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/7332cdbe7b7dc363adef2bbc3f5e4092/73015564074.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/29124193365.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/tepobopapotumosek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=tomato+is+rich+inPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 17888 bytes
SHA-256: 89df07c9d4317dca772f42176a195e24ec9d992b1ad5a57fa45f6a03ef462fcd
font_01_sfnt_off00012673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12673 1920 bytes
SHA-256: 4eeb9c1d75b788b56c7e9bbbbe0dcd0fe632c63fe71f2c6643b12ef1b984e79f
font_02_sfnt_off00012f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6A 10280 bytes
SHA-256: e712d4d2e08479e58df3b004da8d8c962ca8a18fb77efc60fb2d36b0b7c9236c
font_03_sfnt_off00014660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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