Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d949ace1814fc5d…

MALICIOUS

PDF

87.3 KB Created: 2021-07-20 22:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44ba9082021e9fa648f9b9464f381957 SHA-1: 7ffeb1bd97c6e859ea0d4f91e70764550576fb7b SHA-256: 1d949ace1814fc5da1aa5a3a75abc36b77106ca33233cfbcb4740047fdd57811
156 Risk Score

Malware Insights

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

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, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites, likely to distribute further malware or conduct phishing. The presence of numerous external URIs and link farm heuristics strongly suggests a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/995ddb0bc2e2a5ddc6e510ceafb7f3e5/24421242036.pdf
    • http://imssp.by/data/images/fxeditor/file/61760359255.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/dffc73c18bbfb7251b98eaa381d65313/diridomujul.pdf
    • http://slanfusa.org/clients/47225/File/30420847926.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ee00d647161c899f31abbeb62591212f/10679076998.pdf
    • http://yoron.net/up/files/tikuzenowavodowagunozar.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cea202a75---jaxomijoluvigexopu.pdf
    • http://www.mediagrand.hu//data/editorfile/99331095992.pdf
    • http://nexxosrealty.com/userfiles/files/linezepopaxogevomovar.pdf
    • https://travelstore.tn/userfiles/file/dowamova.pdf
    • https://eghamatyab.com/basefile/bainbookcom/files/vikaropofesigupogubamu.pdf
    • http://inlygiaylynhua.com/upload/files/24384275115.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/7065510ef1aa5aedab92a0d6ece64101/zavikomejakuvatefes.pdf
    • http://harryreichert.de/uploaded_pics/News/file/66236201760.pdf
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/74553988786.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/7a126321bbcf90e25267203b42c95974/7483262057.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1293d363---dexesisanageno.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e73932768ad180cbec5181ca7ec8a73d/82573473071.pdf
    • http://iwilldoit.ru/uploads/files/files/kakunawapumetuvofaxitabup.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b65615f0361---64984667819.pdf
    • http://jp-cable.com/d/files/sunadovenudewufara.pdf
    • https://nutrishop.in/ci/userfiles/files/dirogakel.pdf
    • http://naucseto.cz/storage/64094876834.pdf
    • http://www.hangmandigital.com/files/file/78298629568.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=inshot+for+pc+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f32c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF32C 16792 bytes
font_01_sfnt_off00010b43.bin
6d15a57521e83891cd969ef9f7acbb228f721c340f09bdf02748e75b670e95b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B43 10660 bytes
font_02_sfnt_off000123b4.bin
31e56da85a2741aa3b42d1968418ba99158df3e485b5f7b04327b31c33e16539
pdf-font-stream PDF embedded font (sfnt) at offset 0x123B4 17108 bytes