Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d24c0a4509d2000…

MALICIOUS

PDF

90.3 KB Created: 2021-09-04 14:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea02c881118f2ca83c4f6b3b7505d1f9 SHA-1: bf37901b9ad6b9fc66d986e4f7397eda5de3a9c7 SHA-256: 5d24c0a4509d20000e46841de84b4c9ff6ef619a819029701ff7c2614cecd22f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://hanasushimenifee.com/uploads/files/51162657007.pdf In PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56b341bda---nuxisojiwiseko.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/50927295518.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161181afbe447e---bokuwut.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16088bb94c893f---voredititezixemopameboz.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d40bef6c891---puwuwojenofu.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/jisawulemurolesutuzex.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861bd97f74c---visukuxar.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/6530275226.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/bajugigexanapusevili.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/jedeviduxurazevuwododov.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/fuzakixegetuw.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/peguko.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609844ea74708---sulamemubi.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/47293669825.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160948ad2ec51b---95923488171.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/00383c5694d9eb292efeb16f4c354809/57318180986.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/xobutoxozidonupewadevuf.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/9bm3cm3vs5c1kcc7v7lkq07rkn/vulisajibupiri.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/gadewiv.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798733c703c---rimeburetib.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/1ae5e9dc7ac115e246260029d53219de/16686637019.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc5017613e---ruxewarupegabekozajipo.pdfIn PDF document text
    • http://medrea.ru/upload/files/72944381845.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/39945450bff40747c936a1d1dfe904ea/24721623213.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/91993238622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hks+evc+6+ir+boost+controller+manualPDF 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_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 10948 bytes
SHA-256: de752d92fa54953ef84e2e4b18a0e220db90028022ea7500be80a48bcd50396e
font_01_sfnt_off00010f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AD 18976 bytes
SHA-256: b93877d2609f5baf49c5ee105ffec4c4b0f660f112ff0752f016366aaed4d4f6