Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dacea8492d2fafe…

MALICIOUS

PDF

71.2 KB Created: 2021-09-28 05:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8e27e24d3ffb825164f54dff21a715d3 SHA-1: d648510cb785166e3d2f6b5b86e8683ba78e3d46 SHA-256: 4dacea8492d2fafef26b7e817489801c86753ce634e18879e4cea46348e1832a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of external URIs and link farms suggests the PDF is used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://aybar-gallery.com/userfiles/files/wijusimojod.pdf In PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cc815d16f---jizomuzexezoji.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210916044559.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd4da4bdfe---fowemurosutuzipirutipaj.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/wulalojubokufujovumizuvet.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/22824573588.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/palofunami.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/64445930456.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/34124372120.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4e533a672---98963687061.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/lesoxelu.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/34992367406.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/50374998615.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/kokofo.pdfIn PDF document text
    • https://rakbah.healthybitespk.com/alpha/ckfinder/userfiles/files/dufurozeniwufegeru.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/28021818712.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090717541973499.pdfIn PDF document text
    • http://crediramasrl.it/public/file/4992796635.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/92321062591.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/20dc68d2c4a3edddcf54abc064e4adb7/95044996987.pdfIn PDF document text
    • https://scalping.ir/data/files/file/bukadoputiva.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/lidipijojukikaniperonuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+pdf+reader+for+pc+free+downloadPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/53300619233.pdfIn PDF document text
    • 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_off0000b1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FD 17576 bytes
SHA-256: a1fcfde681e1610e5ac8940ff565a5293323ae7eaccd7801b3c8794a5c234821
font_01_sfnt_off0000deb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB6 10660 bytes
SHA-256: 552b09eb08ed113b9ee274d1fcbac75ab0909fa9acebd8502a420cd56dc6a8de
font_02_sfnt_off0000f765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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