Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc8a607f707e365…

MALICIOUS

PDF

79.7 KB Created: 2021-07-05 20:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3eba91d5e095f323e414cebb83e3d133 SHA-1: ed180c70ececeb7c8fc86beaf6c5fa1d1dd7eb2a SHA-256: adc8a607f707e365c0ad2c900801ec1c7535fbfc4315a74275e49a9896975767
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious hosting, suggesting it functions as a link farm to distribute further payloads or conduct phishing. No scripts were extracted, but the PDF structure and embedded URLs are strong indicators of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb53d67345---77498232384.pdf In PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8cb9597d6c774dd7043da67f193b9466/74752385588.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/b20d3a90e177555b506f50b19ae4907d/15981888173.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/bf546d3e1f5715e04372acac94d66650/lufuxiwunanojagika.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/77pvuamh0nuamnpk37dqbhi7v5/79073244718.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/989956a36205fa14a0c8eb21dd8df876/febivutotuzepememib.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/xujifatetomafa.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609285a5caefc---79636625752.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/5e933ddb3964e1dc3099a116c7942292/21641314446.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/19573614581.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/wufopomudelezekaretap.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/6a309c0fbcd02f3aa868294d34cca17a/lapakofapuxirofonigij.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/16699603297.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/nopavuniwurajomigapam.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/je23utv170pchtjqmg8tf88pc0/genavumodunor.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7b6de7332---62313266431.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/a0541fb47446f4dc68b3820e01bea832/betusawofa.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bfea26d1a96---divawiropitimuzizajiko.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/9378728838.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/wivejovezusini.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/4939249394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=all+free+knittingPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/06bc8a6f61cd5a007998d574240354a4/94245096724.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F9 10012 bytes
SHA-256: 450a7c5cd69b1529a0de850b9a218497ba6ba6c1b77760177291531331c17feb
font_01_sfnt_off0000ed49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001055b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 16592 bytes
SHA-256: 39b54a8352564b5a0f59179f91bf41f66b7fc61d4586a8a2c7091157563f7239

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