Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1ca13c50da846b…

MALICIOUS

PDF

85.7 KB Created: 2021-07-21 13:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f537a71a26d2c3fec4aa3aa81047a8d9 SHA-1: 9faf7589e0ccceec4c367eae8093da361b1c81f0 SHA-256: 4a1ca13c50da846b1a854c86fd4bfe539fe9d530f79de41539f34a3f79c76e08
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple compromised WordPress sites, which in turn host other malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malware or engaging in phishing activities. The document's structure and numerous external links suggest a coordinated effort to distribute malicious content.

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 http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079c9321910f---20751539812.pdf In PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071c6643a48a---fatutudatanujedudi.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/dacce7e56278a28c64bb667eaa4f3a03/vijolipagalozo.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/38506963023.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/najizuzosemenodejigo.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/19452893269.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/1umjgf0h7qeka31lggvkbe57p5/luzevivasoru.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/lobukapubas.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dgn2t6rhsqfuo04f7dmpbki6r7/logipuromajajukenidogola.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///47321323329.pdfIn PDF document text
    • http://valeneighbors.com/userimages/logazigikazifimi.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/48921ed85802936084f987b0cd4a0182/25352487488.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160767f2a4916a---galiranitujegumajonanusu.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/56270582244.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd1e931660---rubir.pdfIn PDF document text
    • http://jinxinghotel.com/uploads/files/repid.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd13dafee4---44069177243.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/joxireva.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/runegisawedojinosuwe.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/narit.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/39194957937.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/m5nst4g4b8gvfmdgu4n5evahvk/97467830553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=prostate+check+what+agePDF 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_off0000ef8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 10448 bytes
SHA-256: 0d621184bd51e19d0c078ef2ec75090165be1fb7d66384c0d243be636bb4d20b
font_01_sfnt_off0001078d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078D 16340 bytes
SHA-256: ed7be61894db44615222ad4cf4df4a180de085a60383fbcf334610d2e1f82668
font_02_sfnt_off000131e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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