Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27b9f29b5f16ff9…

MALICIOUS

PDF

83.0 KB Created: 2021-08-05 08:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03975ef71e590ec2ff0c6041b1cdd4c0 SHA-1: 7803642d2947c925e9c24c038315e20be900a582 SHA-256: c27b9f29b5f16ff958057f54b514f80ca3893675069cc3e10de8ad4d505b9113
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs supports this assessment. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=loteria+baby+shower+gratis+imprimibles
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/eb3dcf3c84410b52f0ccbee164bef904/xivifimogulaseberebij.pdf
    • https://a2designbg.com/userfiles/file/tedevuvodolebubeboj.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed881e2a67---72800002865.pdf
    • http://bscartridge.com/pic/xadanawaxo.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/6a4c9f9ac62521de42c8eb70ef8bbbbb/palazubofowebazunes.pdf
    • https://noithatkuongthinh.com/uploads/files/84852868043.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7a239cf39---setodifi.pdf
    • http://meble-tk.pl/userfiles/file/madunuzisalasojita.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608827666c50f---71491200560.pdf
    • http://rideco.hu/upload/file/61735791904.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/qb069bq2dhmgdc7in0s98cs9pv/33908185556.pdf
    • http://whkmradio.com/userfiles/file/6712410901.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06964a6a04---lolabubewadibef.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d91dfff3484b030600842217def36184/jatajawudotijugiditosu.pdf
    • http://atonoserver.com/userfiles/file/ragudepaxogemimebigu.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ecb0a1d7ecca54bc281d2934fe9f70be/45904504122.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/42993f4c8e443e2ac467e8b3763ffffc/sifolavexabusud.pdf
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/revoloxamakimokutit.pdf
    • https://capitalsyndic.com/userfiles/file/62103191426.pdf
    • http://apartmaji-zunicmile.com/uporabnik/file/vopun.pdf
    • http://radio-salsa.com/php/rs/filesupload/file/firudilapaxojono.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609475c325543---90895352373.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/4591a3a2b4f4d45c454dbcaa233ed188/36589323063.pdf
    • 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_off0000e427.bin
b362f5648d596eac896227d63852fd5d8949a4f9a24e61e71718aac521f289c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 10892 bytes
font_01_sfnt_off0000fd41.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD41 16792 bytes
font_02_sfnt_off00011553.bin
2f562f43d8c33c006e4b1416e6bfbfaab7bf46454d9e1f4614d4a5a33bef813f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11553 15704 bytes