Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac584d2bce34a309…

MALICIOUS

PDF

82.5 KB Created: 2021-10-15 00:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5562053ba60477770585749264bd5f71 SHA-1: becae6eaade3f4523a880c3dcbb26d891f8f2739 SHA-256: ac584d2bce34a3092cce7f038131590db6e396cc51426f021264c131945178df
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to download what is likely a password-protected archive, a common tactic to bypass gateway security. The links point to compromised CMS upload storage, suggesting a distribution infrastructure designed to obscure the true payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141a81b35ea4---vobivilakadaridifima.pdf In PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1582f8e69078cd8f119082bc307663cd/ludomewoxuxu.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/16587635621.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/nakowumef.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/30793203206.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-23/20210923024936421720.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/niduroruwinoxub.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/54119826445.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/26356171576.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/muwupusobe.pdfIn PDF document text
    • https://deverfgrossiercms.deindrukdemo.nl/upload/files/84233712251.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/fudexoxub.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133632af2db0---55732995141.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/gexabub.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/lapatasisuvel.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/ridunupewezebogew.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/niwaxetadubesubojilag.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/183391679.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/zudozotemaxelaz.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rkm4gt0mmc7hhk4vehfn2enrfn/gupavejanag.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/muderitise.pdfIn PDF document text
    • http://divelife.kz/files/file/sugotizun.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/jonoziso.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/896FEnmJZlk/uplcv?utm_term=cryptography+and+network+security+solutionsPDF 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_off0000da69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 18348 bytes
SHA-256: 01eb8f4a2b2f388e21ae19b0a98210021d74c4588c34d4560b3ab06a49b76dcf
font_02_sfnt_off000121e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E2 11216 bytes
SHA-256: 5c3f74aeab05b2e44bde306f6184b58ec8e0976c535d0b48f1cef3b3c4ce5a62

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