Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda37c9c85d916ac…

MALICIOUS

PDF

109.3 KB Created: 2021-06-26 05:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e2c8c5d955e22f7c31c26270fdf98c17 SHA-1: 7a9545ad55c0035849d83301bc21158b9fee274b SHA-256: eda37c9c85d916acc7d84197d88d235ded5439bb01ebe29bc7411881aa63ac1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/2849edf8901fb6d55a07a467c2ca8aa6/xabovawajexu.pdf In PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/1cb0c554da13d1b058457770a4408b52/valinanutajefemurenilom.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/11889738878.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943e0214396---25473270577.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/pitopagovomupizupujep.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/dvncpnm32j64lue76ug2p3uv34/77936084356.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/tejadesajulisupevuti.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/31850917625.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98c635df8f---71383892705.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b25600a4ec---53449494228.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/74774eb2b932a0e15142576228562d89/nomuzusodenizopi.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/85824675653.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f142a0ef42---majejaporigilol.pdfIn PDF document text
    • http://mextro.de/upload/files/76275280882.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7a0a5dbf0---xegositiveba.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/15455233056.pdfIn PDF document text
    • https://bnovum.hu/downloads/wexugetifater.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0qs39chmu372ltpnipu9a85c4e/mikomutagonive.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/afedapivojepujemowiwowid.pdfIn PDF document text
    • http://geotersrl.it/file/labalasarajipu.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/44414221126.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/pobekelemuderef.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/jewodelibud.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/30647593894.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/58bff99238da4eb11acf577cb53bed38/68546941971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=family+kinship+and+marriage+in+india+pdfPDF 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_off00014aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA3 17108 bytes
SHA-256: b7782afc9fa1a2bc34b0989373081429a7f65715a8b99db66f29ee68430887b0
font_01_sfnt_off00017719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F30 10912 bytes
SHA-256: 18efe8816d5579a1a5fb3da70c626ddda167613eaa8ba1d734908cf8706fae0a