Malicious PDF — malware analysis report

Static analysis result for SHA-256 480fe86ab4c389f8…

MALICIOUS

PDF

84.7 KB Created: 2021-09-10 00:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bc9d7a996738c68c9336803944c749b9 SHA-1: 2e9837aaa79a4a262fbad23cfffecdd7aaeab2a0 SHA-256: 480fe86ab4c389f899756fc063f4d42d4743c85df3327177c449fc11833397ba
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm hosted on multiple domains, some of which appear to be compromised or disposable, suggests an attempt to trick users into downloading further malicious content. The embedded JavaScript likely facilitates the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lekkermooi.nl/userfiles/file/guzijire.pdf In PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd9a4cfe7---57757594256.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/87610214070.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/6922942149.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/78134732620.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/nefobizefitosi.pdfIn PDF document text
    • http://esipro.be/userfiles/file/44724093879.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/10055117987.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/92761026122.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161344bdb4acc2---74963233696.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/40664610212.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/vakaribanurikimazaxaseb.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/24827039382.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/8641538801.pdfIn PDF document text
    • http://umhouses.com/uploads/files/26691259898.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/bexakufiwetosigobonoz.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/66640676520.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109030350544709.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/zumizuliw.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137577287b9e---94314727907.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/wibinatijejofomulixonuzet.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210901171349.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/pilodewebona.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613642bfbd7ec---22473045820.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/budirinifotapupika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=cover+fire+game+download+for+androidPDF 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_off0000cf8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 16324 bytes
SHA-256: 0e2cf5dd22939ac676e21d5de0a402a057429616f1af9229e8a83ef414ceb916
font_02_sfnt_off000111ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EE 17604 bytes
SHA-256: 8238701e7b94a065d0371c0a0400ea755d193e518a8574443c21eeecc996abb9
font_03_sfnt_off00012cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCA 10616 bytes
SHA-256: d5dc2e523beed8359e25d3ae605c2ba3c4bdf747a8ec9baf29f7de6cf0c086ed

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