Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb53dc3933234b2…

MALICIOUS

PDF

75.1 KB Created: 2021-09-18 07:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d7e4f0b7f1a184deaad84a97caf01bc SHA-1: 430ff20a377bcc87c1ea44bdbc4542bf0b4a2d3e SHA-256: bdb53dc3933234b2a9d996ac22960193159e3273085f51cc742325615280760a
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 ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with many embedded URLs pointing to various websites, including those hosted on compromised CMS upload storage. The primary purpose appears to be directing users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ambulatorioveterinariocamali.com/userfiles/files/79941519570.pdf In PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/17800462687.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/b272045f7f5450011a1c10a939728f35/11230026553.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613493aa71c51---badogelofonigo.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/31166480918.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/63792400957.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/kojabukefesojotuzuxenorib.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/nagapapefozizoko.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/logujavu.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210903025451.pdfIn PDF document text
    • http://kite-surf.sk/files/79838386570.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/pufowixazub.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0f6ed3eabb7372a3b157e1be35f0d985/wujudowemozuzipevol.pdfIn PDF document text
    • http://meditopthailand.com/file/73364520852.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/vegid.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/penuxuwokadavej.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/posisen.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fd1b23caf014840d8390cb5835d9a0e0/dofufaj.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/36187982935.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/94405873782.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/vazajiramiwujotaxonazegej.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/70876545855.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/65460117223.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/ruvajulonuzetidopibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=idm+latest+version+2020+free+download+with+crackPDF 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_off0000c12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12A 11180 bytes
SHA-256: 4762e44a834ff7bc86bc337dfd432072785125de50984aa998fda04e05ff9bb9
font_01_sfnt_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 16668 bytes
SHA-256: e7e0d30d5269c0311227d0e24a39a7151c9507a066edb5746cb4ce8874261d66

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