Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1fe8d69b5a74c23…

MALICIOUS

PDF

88.8 KB Created: 2021-09-18 01:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ede16393dd9c5f392429ac3db7f1e74 SHA-1: 8ffbc37b6990c94b1d5f7bc1e1809d47314a87b3 SHA-256: e1fe8d69b5a74c2361ff53a6d3f91fd35a8b2b709078c6eccce650cb2df30767
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://joltiy.ru/uploads/files/32965003354.pdf In PDF document text
    • https://biroestarsa.hu/uploads/file/rekogivedagim.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210916212417.pdfIn PDF document text
    • http://princeverma.in/uploads/files/53726671013.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e7026def5a1c6bbe69714cb1515a4140/80734007822.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/p5ohk6096jg4htns455s4r3i4n/bemukil.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/99998416221.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/japitijorinelijoridoledo.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/89227a79f1b84e36466f69b9a4ed9946/vizunorebiwuwezosexebut.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/jinojeporujivoz.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/30120308714.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/4a2f6abe4f03e39f4b646f536c85656e/94687168815.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/dedazekexelabonalipesokuf.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/18012615507.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/tenoraxisekorunoxuse.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1eba94884---73078526308.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411828b07f3---16322684556.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109010048294426.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/fogiwavodogusotakijav.pdfIn PDF document text
    • https://kham.vn/userfiles/file/9162074492.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/76621898732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=naruto+shippuden+ep+344PDF 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_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 10768 bytes
SHA-256: 510a32a5ffea9c3692b598d3f71a171e07911ab301dc9d26fb8622c5f70fdc5c
font_01_sfnt_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 22332 bytes
SHA-256: 67a4833f992f9004ae8cee12f1e3a9724230866e1e50b7b39ed64ca291439593
font_02_sfnt_off00013dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1