Malicious PDF — malware analysis report

Static analysis result for SHA-256 03130875cdf687eb…

MALICIOUS

PDF

90.2 KB Created: 2021-06-28 19:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 63994e59a6a20c934fba3593a08173fe SHA-1: 2975bdb2443ce5198c475f22ca4c62d7c6d20196 SHA-256: 03130875cdf687ebf99ab5ff0e5800b72f2b71d6ec8cfe16e5677bc20dc262ed
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. These URLs are likely intended to redirect users to malicious content or to manipulate search engine rankings. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed for SEO spam or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=kitty+purring+meaning PDF link annotation
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eae44b571---gujekuputevuxaxozidopogis.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c2d56af9e6b90f507deb77de61637893/tazolevipinikufofuf.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6d2017ae---muvumufixutunagulofelezu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e79840a11e4ca6317c459a931480c49d/fokirinokoludoloruwe.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/1f443f6347f09a466c7797f3f1f487a9/wimaza.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecfd1a467c---gexis.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/574db2b8a8116bddb97b7b11fb2e2073/68506234067.pdfIn PDF document text
    • http://vishalaholidays.com/ckfinder/userfiles/files/71531442147.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0a48649bd---dolujapotovemalu.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/nixisebaninuseputifuti.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/92631582927.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cd905c6fb---tarokadoz.pdfIn PDF document text
    • http://web68s.com/upload/files/nofevufipakububib.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/9f7aaef1527fb1fbf2ce6b64c6ff24cf/jijexeno.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/0f45b6cd6f2876f9adfb2568e873b218/8348677589.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/174ef60fd7d7244b11b4ae207ac41c5e/nuwetubazixeluzabel.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/bilagog.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b806c24b89---46754056078.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c48959e5212---16332771520.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a769951e9---tedibazavogovoja.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608964ae43fbe---13067668900.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfe7972aac---15421936295.pdfIn PDF document text
    • 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_off0000fcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 18152 bytes
SHA-256: 965b926d7eccc97aacfb464f35cfea49042466b3981150010aa982b687cd7657
font_01_sfnt_off00012c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C49 10468 bytes
SHA-256: 0e135f4baa653dfe0f3e32c061bd2d63ea4df85b022f91a143467fc338b19043
font_02_sfnt_off00014409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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