Malicious PDF — malware analysis report

Static analysis result for SHA-256 52db36611aec9995…

MALICIOUS

PDF

85.0 KB Created: 2021-09-23 01:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 460f7f9b4311c31b7258a52edf1b29cd SHA-1: c6b74a12a3a458be07f3706b28d999db174e5b91 SHA-256: 52db36611aec9995a3610efa3f5ea2a34cfcc1adaf747ff909b814775fb7f853
156 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 websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of 'utm_term' in one of the URLs suggests a campaign focused on driving traffic for specific keywords.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://oniceh.ru/uplcv?utm_term=apk+boris+and+the+dark+survival PDF link annotation
    • http://carbontuning.ru/file/nenip.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/90259556265.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/79450382512.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/19811b10c1faa2dbd8b9e01d4fe4f7fb/kixaliwugufotajak.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/80325658763.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/2ffa6c26a87681f7fd822e2729265b95/nabukotuzure.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/75682795528.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/45073713920.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1631830520875454068.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///84946799682.pdfIn PDF document text
    • http://castel.lu/userfiles/files/loneduwonewitopaguzisin.pdfIn PDF document text
    • http://storemisr.com/uploads/files/xuvofijasumubume.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/79203324764.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/lidivoxisozufuwere.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161350bb6bbab9---luzinoju.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/263726304.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/xisulidopazaxepapopemu.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/tejat.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/gigonawu.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/nazim.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9c513fb67---kaluxitifituxabozares.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/f6394bdc49e90c190488c0403f17a7e7/35228400613.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/23532022516.pdfIn PDF document text
    • http://wwsm-us.com/files/file/96779327745.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/fusadanexekemu.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_off0000e706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1D 10868 bytes
SHA-256: 500de6aba596a7878039e548ff1ccd1180763dfb69ef97f7b729f90553b2f3c4
font_02_sfnt_off000117f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 17776 bytes
SHA-256: 5b0ef2083bb0bce3bdb4fcfbbf7b83c71fc9bbbfa99bbe54dc844a40c44d1794

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