Malicious PDF — malware analysis report

Static analysis result for SHA-256 88295865839b0bfb…

MALICIOUS

PDF

71.0 KB Created: 2021-09-10 13:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e2f7542a5619482395791715820d068b SHA-1: 7ada4ec9537e41fc5c05c42fe159459092b8c5c6 SHA-256: 88295865839b0bfbb5ac47c4ac9cf21484c3dbeefb371a317678342a3e4c4a5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on compromised WordPress uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or directing users to exploit kits. The presence of external URI heuristics and link farm indicators confirms the document's purpose is to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=how+to+hack+into+someone%27s+iphone+for+free PDF link annotation
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613480c463bc1---54880189757.pdfIn PDF document text
    • http://netflor.pl/upload/File/13458757730.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/20574953328.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/fuzebobevaroda.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/zefezudulinuvinadevivuto.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210907210951.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/94111219830.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/zonaduworakomewuteli.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/5527569272.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/tutuwejeja.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/ladevasanikivumezatetegur.pdfIn PDF document text
    • https://kuepancong.com/contents/files/sapiwewinixawu.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/63886441877.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/winejejamujufokepuju.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/bd8900ea164d3573354149362194934f/nuregugurojelot.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/42897720826.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/97083798792.pdfIn PDF document text
    • https://cet.sk/res/file/witabi.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/8f2226a579f5445f902baf6800f5863e/kunebizewatip.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/mijubofawo.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/30619183402.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161326d449ed36---fakemululelexoraz.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/06c963005b589b11e5b0ff0eac4040b3/28961610642.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/76710115232.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_off0000b743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5A 10900 bytes
SHA-256: d20a7aae2ea9916c2ba24be0eb393a8e4fca06ac36bd75e69a6a08312533453d
font_02_sfnt_off0000e87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87A 15024 bytes
SHA-256: e8f782ff29807cea002140fc6082dbe44a82a82c82ce99b3fbfe4e940c93109f