Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d1aa8f6a472387c…

MALICIOUS

PDF

83.9 KB Created: 2021-07-31 04:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 73f1b4e067635657702af54d530667c7 SHA-1: 568a66a93a24d43cdc7f2ab5884b10a3b296d0db SHA-256: 0d1aa8f6a472387cb0d75abba87daaeeb707697405b824f90756ca0ba837ede1
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier strongly indicates maliciousness, and the structure suggests the document is designed to lure users to external sites, likely for phishing or to download further malware. No scripts were extracted, but the extensive use of external links is a primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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://chcial.ru/uplcv?utm_term=ultimate+car+driving+simulator+apk+mod+premium PDF link annotation
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/tae0prj971b702q6fmiudmec56/56495793379.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/ffedaa8e411935a91c9b96e1ad668cff/takovena.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/titodozorusozenusejuta.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/vegomajigufadedodubi.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6a5a515a02---nalir.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e396bed1c1---42925935618.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ems7rgrq6d6ftlt02uifgksbli/22052663999.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/talikozozipodafetoxoso.pdfIn PDF document text
    • http://sy-smile.com/upload/files/memugelumexito.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/245f482f879ae8aa9a0ba58bb95fa80d/25026616459.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/98724501234.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/e8cf8907a7d293f0577550a82337ff32/73197296025.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/litumobolemetujibemij.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/77201977447.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/tiboriwagosixesu.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/wemeji.pdfIn PDF document text
    • https://t2sc.me/userfiles/mowef.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/velakimotuvedetiriteg.pdfIn PDF document text
    • https://digireg.es/upload/dalekakusurizevute.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ddcfav62q3ha6ise8m4sn5a7me/70579204137.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/nuwukabamalosenuxij.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/ruxuxulolimevalumotuder.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f3e7bf889755848b7940d0481e186174/11040755981.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/jifotaso.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/6d3e75b7d3332979dc336b0359576c43/92519757342.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_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 11124 bytes
SHA-256: e5493ea91822b6c80cc6c24810a8d94eee7cb2265510184bd247fb024aace937
font_01_sfnt_off0000fa09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA09 16960 bytes
SHA-256: 272860a7bb0a9cd6b74be53eb39dd494dc06df28236ab8e3aab78de4884e48c7
font_02_sfnt_off00012676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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