Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb43c263e8c09d6f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-21 20:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c9168bfd3dd6a890e72e526228e12d7 SHA-1: 88e65d07e0f4f813b4a1986220febd4bad19a075 SHA-256: eb43c263e8c09d6fc137fafed1bcf1b8e009e8e30f9690cd684b72afaa8b4dd6
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 are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of compromised CMS upload links suggests an attempt to leverage legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://handsonmontessoripk.com/userfiles/files/lasedetel.pdf In PDF document text
    • http://dkkarsin.pl/img/upload/files/31764579316.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/busidapizupojivogovida.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/55372545240.pdfIn PDF document text
    • http://klpa.net/userData/board/file/53564593230.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141edc9e98f4---79272912392.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/97173913550.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/42200375668.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/zegifev.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/nijulanuxakagovetelomu.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135312c4192e---99632712436.pdfIn PDF document text
    • https://claudiodituri.it/uploads/gosafoj.pdfIn PDF document text
    • http://centronegozi.com/public/17468571593.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/75489380310.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/biwom.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/89861142582.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/74089452592.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/5072364519.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/82098287182.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/zifavirazomo.pdfIn PDF document text
    • http://juha.be/_files/file/kufijokuduzopigidimuruteb.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/527aab9396e6f600748336edfa74968a/78197749799.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/sokanilorevigusimag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=best+gb+games+for+androidPDF 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_off0000e474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE474 10844 bytes
SHA-256: 959409f23a749c195a65220c5e11f154436daca36ee3350f9a6ddecb22d04ad2
font_01_sfnt_off0000fd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4C 17472 bytes
SHA-256: fbcdf4e7f35ac2f74397d90a2a8a123d97ec7b6b6533e86a3a8e219623eff229
font_02_sfnt_off00012a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1