Malicious PDF — malware analysis report

Static analysis result for SHA-256 050c34bfce6ee611…

MALICIOUS

PDF

99.8 KB Created: 2021-06-28 23:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 090ecd0a2bf9123ef7af23d39874309a SHA-1: cabf4462401387765d2e54532d8d64b0f54d3827 SHA-256: 050c34bfce6ee611d7f5b6933f907e016441efd5602af2c970b87de893552719
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. The document body is heavily obfuscated and unreadable, but the presence of a link farm on compromised CMS uploads is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • 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.
  • 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 http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/5esjj04sc9slf6nfkmdnoo8lb3/tolalukizugumidabu.pdf In PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebaf81adbf---mikiregexesozot.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607542ff56e0a---33249921502.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/0b95ce5d78ddc6de75104a21cfcd74fd/webupulakexefebipum.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16095ab88ce1fb---45968029936.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759246ecd2c---22451040854.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e166af77---77894126290.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/35222734270.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/javu4s894g6oiiq220vb0shm39/29758791028.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/30884fa24241f60657a1cc341ae954c8/nixojumezutunofom.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160837ac20be2f---15613960564.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/nulusaniji.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/30721499243.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10db4c3a01---bijamira.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c260f70d9a.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ac28bce0a---zibonowidot.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608af98feecba---70074668029.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/sazedifirobigiluta.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/pjsvrue3o8g1u0ujg7qss29cph/famisarajufidaji.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/260916096696.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a371678b29---xakunoxixarizunumuwiro.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/7929884310.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/sr51ac6d6pkmchhagbgr2clnpe/7567720696.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/90eu07nuki1t6bk85vi5adoq80/muvawera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tensile+and+compressive+deformationPDF 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_off000121ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CE 10812 bytes
SHA-256: 50bd3b98497a03582f897e1b5b6be1cd90079fd4aa32c4f463e6811068f5ec4f
font_01_sfnt_off00013ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB9 17708 bytes
SHA-256: 5cb6ac34738fcfee23aa44dac38266bb9bede9c141c1e6f77e1a03b2bcfbebe7
font_02_sfnt_off00016994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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