Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eae11a4f9ec0036…

MALICIOUS

PDF

100.1 KB Created: 2021-07-04 19:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 78dc9217e6f6431b59c07d50e753f103 SHA-1: f5e0ce38c3bf0ea49c1b90526c9001f1fdba40ae SHA-256: 3eae11a4f9ec0036914c6d6157ed0b01bf0a99d89da363317c9c2a0d07b560e6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, particularly those hosted on compromised WordPress sites, are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/7424a7d79e115344f01ab19e95b74312/89903712531.pdf In PDF document text
    • http://sllight.ru/design/img/upload/file/82545838170.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/64648098451.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/596fd86169db0ebc4370d4f05ee024fc/45978778031.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16079d1eca2742---14965666962.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/64574901028.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ea1074e4a---91652058879.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/sulepudevojoliruniz.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/92b8468adbfbdd89e8399be1bd289920/bumifekesu.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/bunup.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/pisum.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/munopezilige.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914dc9c5aa4---93164384604.pdfIn PDF document text
    • https://sankohomestay.com/userfiles/files/safuwapovokumazevibotisa.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/28212453068.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/v8e52jac4ejtbfb87d25h5pkv9/movopomozopugexiguwepowa.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/82763414420.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/78539776379.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984194420c8---sazuwadiralelosib.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/mobup.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7cbbd1ab89d869e5d5ceca9a722e553b/27567169240.pdfIn PDF document text
    • https://hoalavender.net/upload/files/86468032644.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160948d9f42bf2---dapamazivuneg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=unemployment+essay+with+outline+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_off000122ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC5 10968 bytes
SHA-256: d90034b7c75af4f38d085fb8d3b0c5157def78eea7c8f98d9e7325f7b524da4b
font_02_sfnt_off00015413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15413 18060 bytes
SHA-256: c28773bcf988203f937c394c0edde68b7a2132899f95019c56ab3c98c871a060

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