Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8589f7d5db94f56…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 00:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b7a73690f174fb11ec6b380a875a11c3 SHA-1: 512a2e41f4749cbb0ea89a1fe000c159b594a46a SHA-256: a8589f7d5db94f56b877af522666d4521569bd5e251cb794d0166fd383567d4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links. No scripts were extracted, but the structure and URL analysis point to a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://kiuanai.com/userfiles/file/bomiregexira.pdf In PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613d1b851c90d.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/fosexujereg.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613317ec4280f---50389009167.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/fopike.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/28031959332.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210911043334.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/5fbe0709c5b6e2526b3f7dad13c478bc/3657920730.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/xelugoselezum.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/gesukuxuwapakepot.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/68814075788.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab03b4b31---dakojekujetodominerelex.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/18147218588.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/39887030908.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/kemimezebudipu.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/zozanuxeditokorexadoviduv.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/69594826279.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/zumenaripibu.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/jerujiniked.pdfIn PDF document text
    • http://tid.vn/upload/files/52261212039.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///52009247385.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/1121616154.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/talitufefakolumosigu.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/tunowan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=most+gb+game+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_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 10784 bytes
SHA-256: 0a05836744d6323d571d252b89218dd56d5c34f3e22bbaabcb26f34688a944aa
font_01_sfnt_off0000f46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46F 17896 bytes
SHA-256: 87606eb61a8bc61adacb88444ae4a6ab7fdcddf08aeab681ab7b73c9d4e815d5
font_02_sfnt_off000122dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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