Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa83969ba0345f4…

MALICIOUS

PDF

90.0 KB Created: 2021-06-26 02:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 53b7ce89fc7ad6b91a4faa6f22cc9dcc SHA-1: cf367a80215870dca4ac18f1de32ce0ead1f6108 SHA-256: 7fa83969ba0345f44c2e44cd16d3e827a1bbadb54061c0405fe637132699775e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. The PDF itself contains obfuscated content, but the primary threat appears to be the external links it directs users to.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/637d6a6fed509854de89043d781cc878/fewukizuxanaboxo.pdf In PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0bcef3c34---nebolezonepezusipil.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64b322e996---vanapulapipaxer.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/fobirokapoweg.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/u0nko0bso281867lhq0fphe7te/57917169603.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/14bltfa20qe7j2r73ktue94acg/dukup.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/bazonoroporawud.pdfIn PDF document text
    • http://effektfilm.de/files/file/69097318086.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723108c455c---82539461230.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb808b728a7---wanawakerudalanemap.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/i2fmvtjglivh3259gdfgf5ao8o/rurefufinumonevugurumu.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/bapogofedijatagogidu.pdfIn PDF document text
    • http://apvn.info/userfiles/file/bolimabolip.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e13380cd9d---67172657938.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/a8f8aa15cbb4a20f66381d7531563280/85434736522.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/xuvenalosokume.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/7128549796.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/d860e8a28636541c11cda0306fb34f5b/madodisanozowefesuzamab.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/55caecf3d95bed71cc4fa1538e1831a2/31247330457.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a462c7940---bofetigusi.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/95feec4b1811d9c0d257b2eb4d5cde5a/13915505369.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/butulojebe.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd3308f37---begikuxuwefawogejazad.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/xozojumuketefisixej.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160987587df9ed---74858850643.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/xotomotatanuvex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+solution+of+the+differential+equationPDF 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_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 16916 bytes
SHA-256: b56e0a346a6556b95df5877a63f66fc12d3a5ac836317b1fb993d9d2ef530143
font_01_sfnt_off00012a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14224 10660 bytes
SHA-256: 935eeb5f6345527c2ff80a84d42219eda2a0f91eeb494447b654e7791e6a445c

Open this report in the interactive analyzer, or submit your own file for analysis.