Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6428f3e1e9992d4…

MALICIOUS

PDF

181.8 KB Created: 2021-08-03 10:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bf7bba303494a9ea926638dbd3d483c5 SHA-1: 5e706b14c4579e626f5476d8a18bd97ef75dbd5e SHA-256: b6428f3e1e9992d426571077d5961d92a88fa9f46e431c4ea850e5eaccbf621e
64 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. While no scripts were extracted, the structure suggests a malicious link farm designed to redirect users to potentially harmful content or facilitate SEO abuse.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4058

Heuristics 4

  • 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
  • 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://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0d96623ef---83279804779.pdf In PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6726a65944---4047945428.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/31642966712.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/24731278226.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles//file/1916909630.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/orhq7bl983trl5l74cchseqtt8/diraxipunekomulowoser.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/5p494tc1sjrchhaehungabla95/94144516772.pdfIn PDF document text
    • http://hotechike.com/files/files/51630514083.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/v3gfqdrikh92490br452hna0k1/dowumufiwidanibumeliv.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/l5kdn2scag5orveedsrl38c2nk/1377989145.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c44f62972---60707573529.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/5461281557.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072007ca010d---zadilesilax.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/45479381757.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/h80u7cq31ua7pco4f2c0595ji8/52317851701.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/ruweweguvivugem.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/tbt4lt6stbmqo8a8r98j00ukkd/jumimumig.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/7kams4tbri920rkr8r6onf1ot7/puwob.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/23692313887.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/55142460851.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a51ca5baadd---96973639628.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/4bf46839df4130824cdd27437ee3e02f/26401370979.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210703_011717.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a793d3895---sesovomariwuben.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/melebad.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/gaxisixomovoduwemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=flasks+speed+simulator+x+codes+wikiPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002914d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2914D 10928 bytes
SHA-256: 621605729efcb4aee2a70aaaf0d4a22bd2ced5089fb5c8eebe199173953022e5
font_01_sfnt_off0002aab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AAB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1