Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f4b7ff98195f6d…

MALICIOUS

PDF

104.9 KB Created: 2021-06-29 11:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 66b883a34013fd2159d42151a3af16a5 SHA-1: ebc70ab92f451757522179b259ebf34df0703a22 SHA-256: f5f4b7ff98195f6d5e5bd1795a087c4d254aa9aa3c146c85ad6d7debb3a4392f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness. The document's structure suggests it's designed to act as a link farm, potentially for SEO poisoning or to funnel users to malicious sites. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/h3dc2m8fd7iclo6r26vbsdv7lk/xubuw.pdf In PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c97a2ddda---pazitagavasediwifopivo.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/llt83iiopuc7jhsdug1vmhj7c4/sowavajaruvakixika.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cf2851f54---lesugeke.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ea69bd249---tojigoxa.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/fbabf1f29ba235faab66fc32f9b8c0b7/68172353867.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/merulapozupolewan.pdfIn PDF document text
    • http://learningkey.org/userfiles/sasukugixulekudupepotu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd08408324---gukasugi.pdfIn PDF document text
    • https://kopari.hu/files/file/18938314911.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5bbce7dbb---59778490274.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/jezagudumojorileredefulut.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/nsc499eakaacmtgb8ubfkcjdlu/panuvosogijuma.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/pv2uo31qqdsc18v3ua8vru6v0t/soratama.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/8d18265ba101ddd9a4a1f6e116c45802/fatujewazuvugaxipikogokon.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/vixokoxokiwisuzoniw.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/187b615f3263f12be0d01d969dfa9679/79944967694.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a78baf18a---jorubegidurew.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7adeac01a5---vaxoxomoketonakugi.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/50164692561.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f1c53f91c---xalid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=adultery+biblical+definitionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001140c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140C 17700 bytes
SHA-256: 851341f26079bc10e42548acd0f43a646e06180c022b2c6d638cc83d6f481129
font_01_sfnt_off00012f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F59 20964 bytes
SHA-256: d20296650c35bc0e6c0f8e70f5be1d6c8ce09ab4f55b5c8bf73ecf9d3d2d2316
font_02_sfnt_off00016413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C2A 10636 bytes
SHA-256: a73cf51578ffb4bff56b33e036e9a2d07d15e9a9db15add61fde84040f4d80c6

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