Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8542dac2eb8391f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 20:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc9a80c8fea4884430c4af403e0aa19a SHA-1: 86a49ae66b6342c1e1dab765214381d23f4b3f62 SHA-256: c8542dac2eb8391f0970ab3d2cb3bb1718c0d4ade9c97627178abfe2544b6ed8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PRC/3D content and duplicate object bodies are also noted as suspicious indicators. No scripts were extracted, but the overall structure and URL distribution strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://coretry.ru/uplcv?utm_term=l%E1%BA%A5y+l%E1%BA%A1i+d%E1%BB%AF+li%E1%BB%87u+%C4%91%C3%A3+x%C3%B3a+tr%C3%AAn+%C4%91i%E1%BB%87n+tho%E1%BA%A1i+android PDF link annotation
    • http://client.diffuse.info/files/22735464728.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/gkl706mctfkkf6rdker657c8gt/joderab.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/32879482738.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/tanoboxebogogezopawa.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/35255888585.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134bb2c0d987---64805560075.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d9f409b8a---58199748670.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/65602579477.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/19143944440.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/47910687006.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/tezemirafolijabelikagumu.pdfIn PDF document text
    • http://xn----7sbabjlebzbdsbxti2bw3r.xn--p1ai/files/files/83363773187.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/24730475762.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/gegazuxetiben.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/lanikewiloxaziwag.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/14901727564.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/wamatavenutoguripi.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/padudosotef.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/zerasemud.pdfIn PDF document text
    • http://fygl.net/uploads/file/010415151514.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1491383597612e9d585575e.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/junatagu.pdfIn PDF document text
    • 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_off0000cbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD8 28232 bytes
SHA-256: 59773f2bad1e5f10b2450621afb96acd0ec0d24c184fd2301aaf8e9d909896fb
font_01_sfnt_off0001032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 11940 bytes
SHA-256: a901ecfac63291e0b250f88eb1dbb5d539ff3f6690fe326cb66cd8dd5439b036
font_02_sfnt_off00011d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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