Malicious PDF — malware analysis report

Static analysis result for SHA-256 d656d7dcbf5c450a…

MALICIOUS

PDF

85.9 KB Created: 2021-07-03 07:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8254f0c9e24f6c74dced61c68c27fe05 SHA-1: adb128a476fc3f347cbfd976eaf7fd712c013065 SHA-256: d656d7dcbf5c450ac6821aed6e58a1c2258dacfe7a0e0dd1f665c89f3d890865
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ei-hotel.com/free_images/files/98493199171.pdf In PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/bjur3ija25aa2sui3ihkqamkaf/83877211556.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/9dj62b3j63gu0ujuh3eqfkh9ah/84114776818.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/walikukavabudutizilezoves.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/jonmff2qekrt24g8hngv2b6hd6/fobekulu.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/3684163ea6ce95253790b91a3e948ab9/83515145695.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c745c1a83e3---gituwurovid.pdfIn PDF document text
    • http://princeverma.in/uploads/files/23596707783.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/xatuxus.pdfIn PDF document text
    • http://hyundailed.com/upload/editor/file/63013712092.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/3e998857bb6cefddbdd1c36cf791da5c/ridaguwaxipi.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f09cb6b5bb---lisoz.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/4ec0b5c0d35ba3bd8fe2ccd5d2ec08f7/44515077144.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/lunixaluvivijotimev.pdfIn PDF document text
    • http://groupkaishan.com/d/files/86057571268.pdfIn PDF document text
    • http://12shio5.com/contents//files/masakabarez.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/61886834664.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a9de94ed32f---32291938224.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/dca78bce47f8c569c4d96cd2de2cfbed/63494201809.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/torugokin.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/c8b352cd3708accdfd6412eda7cffe2d/21222576049.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/17e51cfdce1eda425c1c5ac44be831d6/pevojazalobelosoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=hitchhiker%27s+guide+charactersPDF 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_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 10596 bytes
SHA-256: 626f35ca51170b90badacd1bb20e3e035c4c9ea03ede1d0eb9a5124defb1430d
font_01_sfnt_off0001066a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066A 16864 bytes
SHA-256: a0a5f9010792715e70ce519c6f4cf9a591b4a88211db53122893b9aa50912679
font_02_sfnt_off0001324b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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