Malicious PDF — malware analysis report

Static analysis result for SHA-256 4119ed7c2f354769…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 03:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 51752f6fc28c2436e61531be5d187121 SHA-1: ccfa7460c1d4a3e9082372f8609b94d18b2c07c7 SHA-256: 4119ed7c2f354769b58f1e9df995850184b332a09f6d121794cbeb194d6d0a8b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous external URIs pointing to compromised or disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sun-green.nl/ckfinder/userfiles/files/78897577885.pdf In PDF document text
    • https://cfbadalona.net/ckdata/files/mejonokumimomelalujeg.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16294432263702.pdfIn PDF document text
    • http://capableapp.com/uploads/files/gibevisasojolipigovuzeze.pdfIn PDF document text
    • http://malifer.hu/upload/file/bovapibujipozonisajefu.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f7d5b986fb9d1860f989609aec275ac2/verixizobaxubusijegib.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c95ab05c6f---20975580793.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a886a5874---19597312446.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/73982165166.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/53qbomu092ipmd5teq6dp3pbj3/35853671157.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/28110953115.pdfIn PDF document text
    • http://sartor.ru/upload/files/gegotumeronokaxevesepomof.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ea775a5f---tagedalemud.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/80674035316.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/65fa5b4eacac610a6c730e5166aab34d/guvaguvi.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/lerokufiwakumunojirireler.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/15917259159.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094b9507bf92---tunupotolafagabojekopudu.pdfIn PDF document text
    • http://olympusflights.com/files/files/gones.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada52c73dd3---disozupita.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/87858599467.pdfIn PDF document text
    • http://asmolmerdiven.com/depo/sayfaresim/file/72101736481.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/ia4r5b47e5t4jhkc4mkteorjv3/19700664501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+the+apocalypse+dragon+in+dragon+cityPDF 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_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 18172 bytes
SHA-256: e2af43a74d052ef1d1d361078d33c120f7ea32c14dc8f4073fe0a3f1a16a5525
font_01_sfnt_off00010c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5D 10984 bytes
SHA-256: 21ac03c3656bb6b664f124d32d2fa2789f2f0c96b692b00a4b5b77dae46e242c
font_02_sfnt_off000125b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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