Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbc14afa8a807d1…

MALICIOUS

PDF

87.0 KB Created: 2021-09-04 20:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 00327d8e9a600b6e2cf8bd30814052ee SHA-1: 7bab800c7d68c0a4056a00e38b90444b6ca3a296 SHA-256: bcbc14afa8a807d1af436456a089cef88bf7ef877601955805fdbf752e0b79f5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or manipulate search engine results. The ML classifier strongly indicated maliciousness, and the structure aligns with techniques used to host and redirect to potentially harmful sites. No scripts were extracted, but the presence of embedded URLs and the link farm structure are indicative of a malicious distribution or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93e6960f5e---50327424162.pdf In PDF document text
    • http://yourbuilding.ru/userfiles/files/losesifovegenev.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67e57464a0---42987879728.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/67822073747.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b128c285ac7---38221276349.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/xelonilidedemepolex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a645b62a10c---22973470089.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096bbc2cb4b0---73399896200.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/94995767365.pdfIn PDF document text
    • http://synowka.pl/galeria/file/kozupetogoxazebopuninasup.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/74e56f07a373e9a29e0d3357f683a375/88302104464.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/28095986897.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/57298700306.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/napedizolisawagawewut.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/e40521cd0fd4d2e44462406c02bb286a/47008048403.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/252017688cc0c83ee8f606ecfe2a14af/37501517241.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/9877359104.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e5b8d841b---76368842001.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/77039977446.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/61331274340.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/zubefokurobulumiti.pdfIn PDF document text
    • http://nature-revive.org/files/file/bitekalefozitag.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa4aad6ba2---bisilibovinanagirevube.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/moxavugafudateka.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/jesutoxurowaratufuzanu.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/69071217386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cholera+vaccine+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_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 18396 bytes
SHA-256: 92e8142e685e5aecc7fd552ae3ace0e3b445eb7c33ff429e487a2cb6b8ecc5c3
font_01_sfnt_off00011e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13690 10548 bytes
SHA-256: 1ded30d25dea33539316768349024c8aebe9fda3c400c389f79c64b23e6b379c

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