Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8908e4de3bc0ec3…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 11:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8fd20a2dd12aa0aaeaa56277ac66b7c SHA-1: 14b8af3fb9fcc48733c342b6a457071b0f02e6a0 SHA-256: c8908e4de3bc0ec39e40347fa81b41f697f01126b077cc71d5b1b562f6b7fdc8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports malicious intent. No scripts were extracted, but the overall structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wastran.ru/uplcv?utm_term=playstation+4+app+apk PDF link annotation
    • http://healingtown.org/userData/board/file/446283244.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/78546532852.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/foxewijijemiket.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/65297046823.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/22696254194.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/42180056795.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/60424874770.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/uqjuoh5u1krgms0tvavaotpf1s/32002309634.pdfIn PDF document text
    • http://preiss.at/upload_files/files/34586223776.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/fobilatezigadadigefopugu.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/64841202676.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/kanagerovezazanodegixunuf.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142ad7bf3555---83631763807.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/puxifudowe.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161312efb1aaa7---sakexararunex.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/wepitipibi.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210913_43E48134BABEC35C.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d107bd731---77516160823.pdfIn PDF document text
    • https://btegypt.com/file/gasexezutamikuwenapeferuk.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/45052603857.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135a564b9bcf---73379084359.pdfIn PDF document text
    • http://youil.org/userData/board/file/waderediteberifonub.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_off0000d795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD795 10300 bytes
SHA-256: 7f5cf0adb9303f1000bb1821b944ecd9b014c46441090d375a33b17563a31445
font_01_sfnt_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 16740 bytes
SHA-256: 14208a7f284c3c3f61a6973639fa9f4c5ae8f4df02fa0f274e71dee9942cf3f5