Malicious PDF — malware analysis report

Static analysis result for SHA-256 276a28d295931dc8…

MALICIOUS

PDF

82.8 KB Created: 2021-07-01 12:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 371770460dee9e4596c27413a97e0f2f SHA-1: f598bdb96304e9807866cd92b000ea3c4e221bac SHA-256: 276a28d295931dc8d4c72e29e04e9a81b0c5c9941b6cfceef384af88cfc729a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features numerous external URIs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=identifying+high+potentials
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/q1o529goqm6ti1m3l4761342go/35464143029.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb43098811---1412180122.pdf
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/tedovof.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ltthf2fee9pltkiv5mts8seb09/tumejufuvesuxuzefi.pdf
    • http://nandeestationery.com/userfiles/files/vadelukelamip.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/894h22thufqbniuukc34ur80gi/jefof.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a4ceb4034---tomiginazumixek.pdf
    • http://accessiblevehicleservices.com/userfiles/file/judupugunitusejerazal.pdf
    • http://aldara-latinoamerica.com/userfiles/file/zizosaburovebezozufurif.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16098e8b823943---pomujusetedug.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/2890c04f9f3028ee0f409984fd41faf6/riniboxerinujasez.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983732090a2---wenele.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad42d914e9---nalatidobosetinezuzege.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922965afced---62753783282.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/l472i9qhmhb2i23ki62av60p8r/10951043508.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/39dbfcc2dc3f6a25ef9538e7b028d7a8/simazepupevatut.pdf
    • https://daismene.it/file/kokujepugobome.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b07244510---fezobanitumibinogeja.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/pjcdneccaj4f2vji3le7ctsl30/61416632849.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf563a6fe00---guzevabugavalorijajogen.pdf
    • http://shinies.ru/img/lib/file/rikerakilivuwuxevop.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1dd.bin
770caf463fc1bb27878efe70d84c0190646cd85c1f8917788d653a14306a80b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 16768 bytes
font_01_sfnt_off00010d8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8A 16792 bytes
font_02_sfnt_off000125a1.bin
87f5dd35f84139f9259a33434b794c1ea2e97645c566ba9873bc1bedeaedb9a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x125A1 10740 bytes