Malicious PDF — malware analysis report

Static analysis result for SHA-256 7476da04a027d246…

MALICIOUS

PDF

86.2 KB Created: 2021-09-19 20:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aa426bd542a51626fb4190d5ad1ebc18 SHA-1: 1d27a16f843cb17d36d47b251600794c1c52c621 SHA-256: 7476da04a027d24692835449ac5bc0ae5373d7c2957c333d574a5c518b68f79f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of a 'download' lure further supports this, suggesting the document is designed to trick users into clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f8ecf3ac8---5428926079.pdf In PDF document text
    • http://deurenhanger.nl/userfiles/file/rixewalusasopujilena.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/98968464038.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfcdcce766---23404726685.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/11134472385.pdfIn PDF document text
    • http://blccy.com/userfiles/files/woxazefira.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/53899991366.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/19cd8f595db7562e76772511700449fa/47844930457.pdfIn PDF document text
    • http://cwesp.biz/upload/file/83400720437.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/68938907878.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/sawegezarizelumisiwaba.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/10826493817.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/nosadedodunoladozibax.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/tipamufuvejatok.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/14236024124.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/raniravitizisavananodusa.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210918193306.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/polowujerup.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/fokanijarajarinesok.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/15273817134.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/fd6487c6381d9e732debcb5fd3799d9e/viseguwevebunamugaga.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/25932950547.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e48a149ab1---83793559098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=online+converter+cbr+to+pdfPDF 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_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 10516 bytes
SHA-256: 253635ac57f6454f4fb420a9491587e24dd2e4192f769a255717972621605f20
font_01_sfnt_off0001040d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1F 18148 bytes
SHA-256: 1d5e8f9faf857c88868a201b43547f0cfc45e7b58a67c0c30651539dedd2f616

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