Malicious PDF — malware analysis report

Static analysis result for SHA-256 97afb6bcb857819e…

MALICIOUS

PDF

85.6 KB Created: 2021-09-03 22:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d45e941a32a7353aa3af27553e6f565f SHA-1: d09abb5d52f25277d32a6ada2bebc424512f8d71 SHA-256: 97afb6bcb857819ef7a3ede4d7036e9a56933101c74af79b07340a7542d915aa
96 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 WordPress sites or disposable hosting, indicating a link farm designed to mislead users. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4082535a8---37765518002.pdf In PDF document text
    • http://xtra360.net/campannas/file/94422587774.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/soripenemafiwitot.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/92071671136.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/dazavobemuzadibora.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/99cee1d41ec631a433034209ef25e025/pikamizatumupetarefinok.pdfIn PDF document text
    • https://digireg.li/upload/faxuvadiwibumeluwirow.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/dulevupefan.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/zazusupefulika.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/94225966720.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817a7543386---tebutesisudavumedewus.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/18891535239.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e71c1b05d4---lapoxe.pdfIn PDF document text
    • http://ebus.cn/up_file/file/7740168224.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/28789492865.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ce19bc65c---domewabufarizanadales.pdfIn PDF document text
    • http://dgjst.com/upfile/file/7868357582.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/58c17cbb666c2ba9a75e52f78d65074b/jogajotawutizuka.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/f13d0819f8ba184663f4b8f8989a960a/85927919649.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/metinadigogelezoragebasa.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16084a6de20697---5559412147.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/38879794579.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210608120831715584787.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/vemulupawe.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa3e996ac4---35988914961.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160982f1ccc0f5---pubazekuriwoneripuramavig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ventrac+ssv+manualPDF 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_off0000e959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001016b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 18472 bytes
SHA-256: bb58b4f521c5ef253345c4a44ff1d6bc67936f6e0906a6e91e126a0ba156c4bf
font_02_sfnt_off00013209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13209 10316 bytes
SHA-256: c06f8f23ef930d665779a32f70b92d0bb021a3fd17c17a67d2fb168889ba5937