Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc954be34b47159…

MALICIOUS

PDF

80.5 KB Created: 2021-10-13 06:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f408d139118493412e2a4ee1c9966bd3 SHA-1: 83db0324694e6dfad534611979c995c5b5976800 SHA-256: ffc954be34b47159f2c19e61fe8bd71a757ecc1b6bf4373a91fc0f56dd3750ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous URLs, many of which are hosted on disposable domains or compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lawajetudekadelidaronuto.pdf In PDF document text
    • http://oresteruggiero.com/userfiles/files/61012571844.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/91614547344.pdfIn PDF document text
    • http://kodemari.info/data/files/72660646445.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/9205858251.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/77976735789.pdfIn PDF document text
    • https://rajakedua.com/contents/files/pefigizonirumu.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/58504238001.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/32527937157.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/nkem3pq682so10iqi5v8i584qd/vajigawo.pdfIn PDF document text
    • http://apnm.indexint.net/ckfinder/userfiles/files/dozenabofeviluxunive.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210921091353.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/684177629ab6ee8487934e2d53904960/95544052266.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/kafatujumenedunufuradaf.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/7284288414.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/buxojerotunisozemu.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/39390257180.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/gabotasebifadezosumelob.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/68799542102.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/wuzijabuzefebakumumut.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/df325fca32dd485321709f7a8de7e792/binovetezinizemimuvuxo.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/dikilisakifuxizalidawip.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/42099809257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/D9plVHj2VOU/uplcv?utm_term=words+with+d+as+second+letterPDF 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_off0000d49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 10548 bytes
SHA-256: f97f97f838a6c91e5be9cae4013d2cca18269a8dd437bfbd38b91257ebe4da3f
font_02_sfnt_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 18500 bytes
SHA-256: 3fe97191c710eaaaed20f148914e40025f9bcb76b25c4a4daca79dc493554459

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