Malicious PDF — malware analysis report

Static analysis result for SHA-256 39dd7cea75765b2f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 12:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3aebc35c4bed1a59cad544cf744fb790 SHA-1: 0114a6569e263564e524e6f005c0269f36033411 SHA-256: 39dd7cea75765b2f4a5096999e8e5a3becb2e82ce760e0c743abe0c5c0d45c4a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, disguised as legitimate files. The ML classifier strongly indicated maliciousness, and the heuristics identified the PDF as a link farm on disposable hosting. The embedded URLs are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nhs1968.com/clients/65482/File/49475814663.pdf In PDF document text
    • https://renault-service.com/userfiles/nofudefitorikejumizolide.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/97991081252.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/gasagowok.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/27989fb5df5dab74dd866fbee5f768a3/sirimobapejolugoforaxur.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b22eed949b---86099565423.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/qjq55e8uh4usblbcqmvoo546t6/lidixojiful.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/63029720412.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4d6b8bbdc---farujixuzi.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/fisajimazi.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/19773028f016a831efabcae122c63a6f/xalosi.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608343053d3a6---musalefibuzugudezip.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/40494302019.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b871d1801b8---30404874512.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ucm2dpkj64mum422kjafs47fq6/xepavoki.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/25069050043.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c009844bf03---lusidemukinejeza.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/32759763922.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/5o9b0gtkcqsk7tonsvufnera19/jidolodewonuredisomer.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/25888889424.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d26fb38458b---xabiwav.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/fefazigawekose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=infectious+disease+treatment+guidelines+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_off0000d4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 18348 bytes
SHA-256: 9d2f45d5ca085b5542dde56c18bca9d919cae350ee0ea765924c27e435e50482
font_02_sfnt_off00011c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C98 11012 bytes
SHA-256: 34b0d587ce1b3bb0734d71b88c0b757bcc1fb744b307f692bf3b736c8eff7eb2

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