Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a59d52d6fc6a3ce…

MALICIOUS

PDF

129.8 KB Created: 2021-06-19 16:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d28d41135a861cfcc367b09ac62f6ff9 SHA-1: b6d6ca4a11598a437e63ff0ceabd8f38d28e6fc4 SHA-256: 4a59d52d6fc6a3ce295ca14ff48041c38550bc9d784fe169e27597ad29063020
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body, though heavily obfuscated, contains references to 'After effects cc 2021 torrent', indicating a potential lure for pirated software, a common vector for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b06683ac675---xukizijevoxaxezi.pdf In PDF document text
    • http://ajtoablakcentrum.com/_user/file/54663223376.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/mjhs1f8jbiq4unu6dbs2es19u8/16682439863.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/bacec32d4c2eae3b22c5c13192079abc/tosizoravotus.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/34e19771f263289e4eacc532e211adb9/rokuwulopitix.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/0qom45skak3gvjm66qbijrmrfa/dulofixojewop.pdfIn PDF document text
    • https://baptistfriends.org/media/kejiduf.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/a60c4eebf70122eefae5e50b0d3f1976/22378446286.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16077bf4580449---buwevado.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/98f4bf7a11722d26bd06271b207a123a/pugekejalat.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb90312159---gizozagopa.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078f19966e96---ruzebusulanoluvafusinode.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/0d454d49f54608f8f23bfe580bfac7b2/4622894791.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3230b884b---69100581683.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=after+effects+cc+2021+torrentPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001763b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1763B 12508 bytes
SHA-256: 4a7339e5c79f103e205e833c54f17052ddfd73a71bad22213d40f58b9013e588
font_01_sfnt_off00019fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FA9 4948 bytes
SHA-256: 02fd6ea1ca9b54c868543bd4b2796c248d4588966c7dfb30ba50e081bc218084
font_02_sfnt_off0001b0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0A0 16820 bytes
SHA-256: afe8ddb21726147a269f60a1465e8db4e539e8452aa0b5e023e4011c7d12b029
font_03_sfnt_off0001e3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3A7 16232 bytes
SHA-256: f421fcabe5b921e611bb0d41a2e5870276fe426713a3a83cc0ba693326d8f493

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