Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbcbe1015d8b4df6…

MALICIOUS

PDF

78.8 KB Created: 2021-09-14 18:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: accffd889a324a6ffd26e191dc988d7d SHA-1: 9d42dff925557920ef20e36db009fca50742fc30 SHA-256: cbcbe1015d8b4df6ff820392fafdf357a92343d863c7fe84503e814ff8d8ef69
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 indicates maliciousness, and the presence of external URIs and link farms are common tactics for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=task+killer+full+apk PDF link annotation
    • http://rkmaster.ru/uploads/files/puxakarolip.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/61981335912.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/zagekifup.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8b749293---gofabepomafeguz.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/vetudefekasuzifotogerama.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/61627455395.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/16236441208.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/39839260868.pdfIn PDF document text
    • https://businesslife.com/content/file/88393599029.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/76120633224.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1631514040.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/83316266346.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///28684362527.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354fecc1ab9---1036114265.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/liselizuzukokeboj.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/72395189384.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132047b84ba6---wesutolivina.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/suvizexowavemewipuf.pdfIn PDF document text
    • https://casaalu.com/luutru/files/gilefotamofuniti.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210908_032933_113.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/sesofojowo.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/97188130604.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/bokakaduv.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_off0000d06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06F 10184 bytes
SHA-256: 36f9054d53a553ba86079b116af8afafb799ee2f25d6019ed323d8db5aa541fa
font_01_sfnt_off0000e75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75C 17704 bytes
SHA-256: 178e6186ef8d27871017a4aee2f1fb8b3902ba68694e29427379e23fa784edf0
font_02_sfnt_off0001154c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1