Malicious PDF — malware analysis report

Static analysis result for SHA-256 246815af2e3e607a…

MALICIOUS

PDF

82.9 KB Created: 2021-08-15 08:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7f1dc6ef73cb24ea00f229f052d21dfa SHA-1: 58627f202859eef1e90bab434d996ecee57ba9e8 SHA-256: 246815af2e3e607a9d36af4ced6d671c46741ce8b1dbba21daedc47a73ece4ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised CMS upload directories and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://keigan-productions.com/clients/863431/File/95503751992.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ac2fc021eedb9bcb5ccdd3959c3e87bd/92406193730.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/82123e107337adb24af56b19ff706d1c/sidejujaberone.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/31476475547.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f114d80c---24758327498.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/ed428de7cb2621f44a239cdd64ad340b/muxavuvitavegoxi.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/42688388280.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b61fa4ee8b---93777709918.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842ff78c31a---26335054548.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/8f5bf3625b99cfd4af3ff21a82d7c063/3865487661.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/73384252497.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/addi9uhu9he2chbrsvlim60upr/kogoboxikiboniravadadage.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/01018fa4d3d279470ff116f3b5f13bc6/livix.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af6fa68a85c---70026988003.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/egopoxoxijifebigeraw.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b05559f05---39823817028.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/e92c0c6bf90c67292434b4ee972bff5c/golusululibakatuvipasa.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/47478035594.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/paruradosodiletukopunas.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/ad5be92bb2d854036da4e4473e650693/35863199441.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/13750648269.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/sidojesifoxab.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/34828360774.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/sapajode.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/77509427122.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/esv49v7fo2olavccv1dr4uit9a/53781445305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pre-closing+walk+through+checklist+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8a8127e83---51044942569.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_off0000e0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A6 16492 bytes
SHA-256: b6938879158fce9ef0e5afd3b396feb0eb775366ee4d69cb127bd54c91908195
font_01_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 11212 bytes
SHA-256: 3dd633d22299880fd4ea2e781c36dfb1c13725e7333d41366c3c4068e9784583
font_02_sfnt_off0001258b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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