Malicious PDF — malware analysis report

Static analysis result for SHA-256 a806153f4af396d1…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 17:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d2b3861190715cb751f638b5265c1c84 SHA-1: 4d37c8db2b7561d01ab7a45b301af7a6d2bdf14d SHA-256: a806153f4af396d111a189e594f74b20dad00c05abf0ccae75dc8b8d5b8610e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous links pointing to compromised CMS upload storage and disposable hosting suggests an attempt to distribute malicious content or conduct phishing operations. The document's structure and embedded links indicate a likely spearphishing attachment, aiming to redirect users to potentially harmful sites.

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://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/tsprl15n5j0nn10kba6mc0ue8t/banotobelerufefojamu.pdf In PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/19493401714.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/dazojonoxegijifesekiwefog.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/9e08ee419abfa0577196c5fc8a32fcca/mewemoxixewesamo.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/15667522625.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/8e65d4048d2b8cf385613244c5917495/27389461841.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/bepejidepebozavibi.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a756de75411---63811649937.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/vusefixexepapeveralif.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/0glaoqm6m64a1dcd6s02mrmqtg/zilosimekawetalinutodi.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/03f81b8c1fb9b30f10159e21f4c68a01/30574670025.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/88464585329.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/8971820966.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/1008702082.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/dunukopakigepegixezo.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ffe15a10540---fifukaripafifunukejim.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/86016909506.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/34533490463.pdfIn PDF document text
    • http://bjallstar.com/upload/file/30899426904.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080f69eaaa39---86891986914.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/38173952042.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/11079599047.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf8cd3ecca---82211179263.pdfIn PDF document text
    • https://megashina24.ru/files/files/85812496938.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210904020013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=irritable+bowel+syndrome+diet+pdfPDF 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_off0000e051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 15784 bytes
SHA-256: e1fd6f981a08d7eb0492318cdba8c9d10acdd65656f64903bc21282e9ab3bf38
font_01_sfnt_off000108e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 10948 bytes
SHA-256: 7e0f944db5c5decdd21ca765e57eb6139d48ec98af1eafbec6155dd6cf9a49fc
font_02_sfnt_off00012224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1