Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1ba9ffcffabd5a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 15:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e7689216eba56bcbdc7e9afd9dc4be0d SHA-1: b939f259756b7cbc3b0e455be07bd760dcc00cbc SHA-256: ba1ba9ffcffabd5a7eab1e2c3c8475a3a6ac182cd4a5b15bf5207909d134d045
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or engaging in phishing activities. The document body was unreadable, but the heuristic firings strongly indicate a malicious intent to redirect users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cructi.ru/uplcv?utm_term=livro+do+exorcismo+pdf PDF link annotation
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a46573725---wakixujejis.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/geripomisu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af50e7a3806---6996261548.pdfIn PDF document text
    • http://dalaichau.com/files/73969089587.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/62436215588.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607153f0dd310---86131373917.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eab0fbf118---wabawalewosituno.pdfIn PDF document text
    • http://htwy.com/upload/file/90985774379.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b28c11c881---titofagisazididobasizu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/8k0rsn4h1or9ispebthrsnksji/gakomisurotufixetimojefa.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/piduzamewokenotuwuna.pdfIn PDF document text
    • https://adium.ru/userfiles/file/34177806933.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/mozelibefo.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/4p6cgmovb21cuug8886b421ap1/40868738187.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613277af14653---92605660686.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a010fcc427---79153773742.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc56cd1f8c---xekasemafol.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/84253626056.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/afbba403bf5d366bb9991c2dfcd8dfb0/68253886588.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/72334338268.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210813161452.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/nupujeronexoramawuluzole.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/cbf8dc1e5f52d9100222d93a7af26b4c/47626208514.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/82256201358.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/kofijiperaba.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/pukapazomibukepedusoki.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_off0000e157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF969 18976 bytes
SHA-256: 6085e5ea7f54f06cca6e907caf7a49a21c7b375772e9865dd0a3da5c3fe03753
font_02_sfnt_off00012b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2D 10496 bytes
SHA-256: 3db61a35e5b7f44e609250cf59003165c89e7a87a6ded901a209b2230d8b1990

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