Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee276fa67e56651…

MALICIOUS

PDF

90.9 KB Created: 2021-07-01 20:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0662c8874acd3cb3fd83303fcf5d9876 SHA-1: 9d11b21c0ea932e5f33bd92b73353039b7dd80e9 SHA-256: 6ee276fa67e566518caa3ba1856daa604b8654e6512146abd8fdf5f6d29a3c5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 directories, suggesting a phishing or redirection scheme. The presence of external URIs and the structure of the PDF point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://smidgel.ru/uplcv?utm_term=bw+capps+on+highway+80
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73f68fded---75520621985.pdf
    • https://bharatbiodiesel.com/userfiles/file/mubiji.pdf
    • http://pijntherapie.be/uploads/files/83307891595.pdf
    • http://www.prieteniitehnicii.ro/documente/file/betip.pdf
    • https://deltarealestate-eg.com/userfiles/file/xuvirizajolalipi.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ece13eefa7---12749586228.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/muleganasom.pdf
    • http://macabrey-luthier.fr/data/Files/kazipivutepuwitipebiwej.pdf
    • http://arslanemlak.come/file/xifugujulakamijene.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a328758ad47---jadevefebamozununu.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e99a0b1e27a6991b4941ae52ff75d08d/rezapadezidexiziwewala.pdf
    • https://sealordhotels.com/ckfinder/userfiles/files/41945173615.pdf
    • https://rybczewice.pl/userfiles/file/63344839540.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725e73f08d9---zenuxavanuxewigorelovu.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609022d71571a---favimexopepawuzefo.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160758424b6009---zawexipowo.pdf
    • http://omgmediatank.com/userfiles/files/nojogemajawaza.pdf
    • http://hyperasp.net/userfiles/file/82135497426.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/acf72a0bdc589dcd857ab5346e4df969/79826692423.pdf
    • http://angelescare.com/userfiles/file/xesoropopar.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77cb8afa5---95902067296.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1527ab7ab---sakeje.pdf
    • http://dungcucaytrong.com/images/files/wuxufinepumelamaxaxit.pdf
    • http://isgsrl.it/images/file/38347386807.pdf
    • http://aelma.com/sites/default/userfiles/file/gemuzufigesejus.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_off00010082.bin
5a9c6ed375c8a916682d468a243047ba382facdd5d24d8e578a139f65d7b9393
pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 10860 bytes
font_01_sfnt_off000119a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119A2 16792 bytes
font_02_sfnt_off000131b4.bin
a4a8c3a4ee473a644e0f17cbef8ad444f1ba5837a75f889ae0f93b71afb8e919
pdf-font-stream PDF embedded font (sfnt) at offset 0x131B4 17304 bytes