Malicious PDF — malware analysis report

Static analysis result for SHA-256 e46bf19549cf6e86…

MALICIOUS

PDF

83.0 KB Created: 2021-07-26 12:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0cea11888fb586e6e70569216942583d SHA-1: a5352984cf61c0fc682083fdf2bb255bc16e5508 SHA-256: e46bf19549cf6e8675713490e4bbe11df16ea6cd0e5356b284326b0c00fd0deb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous external links, many pointing to disposable hosting or compromised CMS uploads, suggests a link farm or phishing attempt. ClamAV detection and ML classification strongly indicate malicious intent, likely to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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.
  • 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.
  • 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://mynigaoe.com/upload/file/20210606121257.pdf In PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/zipewokegometise.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fade480c315---48663406067.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/5880918868.pdfIn PDF document text
    • http://envigest.cz/upload/file/69542177355.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/41106170966.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bb29e4199---lejudidaxukateko.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/m8sur4bab7f902tk5cuma44fc7/wuxekafolozezaj.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/rizapu.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e70e2ac5f8---55988404902.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/kulagesivobotapiwe.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/wekififoparimiwemili.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/tetekemijugen.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/63364994304.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/wewotilobofuwadedajuruk.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/gateledagifo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c3e443197---98626601025.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/50967828381.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-7/20210507120501384820.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/tanemajidabej.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/gubesunevenuravi.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/miwupebe.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/44529232085.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/43080251765.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/povesu.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/wowoluvalabato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+i+program+my+directv+remote+to+my+receiverPDF 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_off0000e085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 10796 bytes
SHA-256: 555a9057ad69b43b559abb5fb9ae7c49a7c97ee8192f06df5d32997cf7b7228b
font_02_sfnt_off00011153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11153 16632 bytes
SHA-256: 727ccd71016ca2f87e29562a8cded9fd4f85d25156b6d4c2f0d6123281491607

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