Malicious PDF — malware analysis report

Static analysis result for SHA-256 c484fe317683f471…

MALICIOUS

PDF

91.6 KB Created: 2021-07-13 04:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: bac07aa41ab2ca1565ade5287983f938 SHA-1: f0ac128e2f4d56da997c3a4cc2018c48461f59d4 SHA-256: c484fe317683f471930101ca2bf1add7ef83f4019f3050abe38a877caf8d45ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/c553fo9t5830ha8u256k8bpmc7/kikot.pdf In PDF document text
    • https://medtek.vn/storage/file/92525093031.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/ssfcnkk5mql1n8tmcqrsa7u6hm/pivigimutiludaf.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093039f01dce---doferapixi.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c92f2586776---17316986041.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/54231369291.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717ad0677c7---ginarupokinakis.pdfIn PDF document text
    • http://deauville.ru/files/file/72191052024.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/86855133960.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/17571391030.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/runuveredulibona.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094779301117---mamiratej.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/modegamagigiwupeku.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdce553f4c8---60081398477.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/timaximufoboriguna.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/31484139617.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/a11c00eabb120b618cedfca6a4d14e35/94248546946.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/848f5e4b14b1aa876f16493b5c26c95d/gemevozatodav.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6lru4aliikhvuru9n4vdbtlv95/rakifupozipofojubojaxave.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/xipojetaf.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/81458452819.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd78ece90c---nawobeg.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/89222562927.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/tusobon.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095712f94609---99366649282.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e37308834---vabix.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dafec50eff---resova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=metal+used+for+platingPDF 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_off000101bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 10764 bytes
SHA-256: 9402bf99366ea1e47ac17b51ccc28f5f178abaaf36a4026f4fc540e1f0c6ccfa
font_01_sfnt_off00011a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 17724 bytes
SHA-256: f265debee4fcd07dd4a9b198f3b9d73479c348b7b621e4f3dbb18e7b25988485
font_02_sfnt_off00014927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1