Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f19039cdf757792…

MALICIOUS

PDF

87.3 KB Created: 2021-06-27 05:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37a8aac59b8c0b9afb8f951caef73507 SHA-1: c650b1477bdffd6dadc420a57c6c85af5b427d41 SHA-256: 2f19039cdf757792ef7a2b9e27bcadda01aafa0b0fbb22173ae28ce62d5a4873
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier also flagged this PDF as malicious. The primary function appears to be redirecting users to potentially malicious content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/a0a53da75d84c02b039ff62e00cf6f65/watotuvibamuram.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45f8f4d4ef---petikol.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/8ac35a632790218bfd46f132f39699b5/juwawewaw.pdf
    • http://clubesquilacoma.com/uploads/files/49372641879.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/fdd99fea8551136689aa8b8bdf196f8c/jifefitogarim.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae648737b6---zunerijetewezotodevexagof.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7883874f1---26928233096.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a13a001157---87297996734.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/a031352d20252d3c59a200d5f360c630/29568131186.pdf
    • http://kirakuramenandsushi.com/uploads/files/57073736899.pdf
    • http://adaviestransportltd.com/userfiles/file/depelorigawadaro.pdf
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/depojodo.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/d81a41b801956ff8a48dad89aad7be14/xeliluli.pdf
    • http://absolutelyneon.com/userfiles/file/jaluvazagaguxavudevosox.pdf
    • https://carrieres-pierre.com/userfiles/file/desesakoza.pdf
    • http://popnmusic.fr/userfiles/file/gupemafitomari.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a34bc6198f81f175a15524439a1d7a2/79844381026.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d2cd3f1a6d86f2078afaf77cb5b237fc/8549547166.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609de9c1a9916---44548113835.pdf
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/37403075990.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b10b249df61---momuka.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/5eia421hjru3t7q6v6rp1q7gdj/14196224289.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083b03b16e4d---bewejerinafa.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6960c80bfc---neguxox.pdf
    • https://pasarantogel2.com/contents//files/22289383257.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4561b9ca4---55990206110.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=auden+the+more+loving+one
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e902.bin
da7af5c51dd69ee18d345694a5f0cb9bf00eca29d27007f8e88d0f190c6e1883		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE902 10512 bytes
font_01_sfnt_off00010081.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10081 16792 bytes
font_02_sfnt_off00011893.bin
8fdf5b50d2c3c2d537d1cf3c80b50673e4d9ac6ba88db4e1378617a88370f660		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11893 26832 bytes

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