Malicious PDF — malware analysis report

Static analysis result for SHA-256 377cfab7cb84be87…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 16:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 75c11a5a7afb6f6ea391701413bfbc47 SHA-1: 935468541c46dba8f2a5f4e234419f44714444ea SHA-256: 377cfab7cb84be87af41f87850e6a016c7e61a660f146e8bbaa8040521c374b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link structure and heuristic firings.

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 http://diysmart.net/userfiles/file/64908571557.pdf In PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161343716a98e4---pemadifubawisam.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/85361917175.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/repatalexoxujilotema.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/68434339989.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/kopujezoguxoxulaxadebodu.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/3fc3302edcce58aecb3a1ecedc8588f3/tudewaruxefetugagako.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/kexoritumezene.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/86093368086.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/waziguzer.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/notavajuruzixu.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16130592b21024---16486948276.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/vivojubenizikumamugevanu.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/kafoduvavofebenimuvedifaw.pdfIn PDF document text
    • http://riph.pl/userfiles/file/nofuzemanedobaziroso.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/45374280092.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/47736947032.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/difalukuveg.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/suvewozirawizi.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/kovirigerunipabutubivovu.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/jajejumujadez.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/76515881050.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/41977838535.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/86510003632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=baixar+jogos+android+direto+no+celularPDF 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_off0000da20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 18452 bytes
SHA-256: d5ee32e94918340112f54072c5e68d390741267c7f8a8608e22cc6b14e4d24fd
font_02_sfnt_off00012187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12187 10932 bytes
SHA-256: ab879c1cc262ac0415507d6adf8f97eec841ac87f8536f7ab99c66d1cf994a71

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