Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e15657100b275d…

MALICIOUS

PDF

91.5 KB Created: 2021-07-01 15:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d1417358ba39c4d7a4a98842aa3c09ce SHA-1: 721eed644f35a60ca5f03b0a39d1b313f0c98d33 SHA-256: a3e15657100b275d783b52af3f63df8fecdd4f8f8db2e0ba191c4d42bd000b91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised WordPress sites. The document body is heavily obfuscated and unreadable, but the presence of multiple links to potentially malicious content indicates a clear intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/637b8e73de0e2ef119948778767819f9/tinopelulodeluka.pdf In PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/amfrjnojr5nspmbsejlefavdqu/91028878599.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/nufemot.pdfIn PDF document text
    • https://masihpt1.com/contents//files/kelepupej.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210512085935_979574563.pdfIn PDF document text
    • http://betenagro.com/sites/default/files/file/50958701485.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/2300946010.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/22955830406.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/95389866913.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/molaredo.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/aplegh1ep5nr25kc7bbs2t67j4/55089596269.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081edda89235---zaxujumigefezedej.pdfIn PDF document text
    • https://chp-travel.ir/data/file/26931278473.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/28827369834.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b2d96a9ac---zivukasanuwoke.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1f0aebe0a---bisefubemomaborajidugudef.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wazotagibapunivid.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/2213ee33be937906fb83f6bb9d06625b/rozopulozofigof.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/377ff1f38ad8c7b101e6ae0a813d4092/87027426661.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b0c7cc0caa605d5ff6c75a80c3d9655e/18841884387.pdfIn PDF document text
    • http://novichiha.ru/pic/file/69696744875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fury+prot+warrior+classicPDF 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_off00010562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10562 10408 bytes
SHA-256: 59c35e046737a9491216495f524f2b65cc98f8dce57a3e8073944cb8ea9418b5
font_01_sfnt_off00011d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1F 16924 bytes
SHA-256: 8e81daf55f94acf61491ef2d83c8d77ee78dc166e2b5318f5a6a28984c53f5c8
font_02_sfnt_off0001492f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1492F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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