Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f60dcc33a8d1223…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 21:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 79c1e621a9fe93940cec17fe7aebc0c1 SHA-1: 451a6b2da86f511ef67e062b5d37e8552b952c62 SHA-256: 2f60dcc33a8d12235e4e96264aaefef56b48d7342fbf3b1a1600d1be8609c328
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to phishing or malware download pages. No scripts were extracted, but the presence of multiple suspicious URLs and the overall structure point towards a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://sun-eko.eu/files/file/xulifad.pdf In PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/7945286c72884273d6052348c84cb4f7/nolurikozojewez.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/5db6df2a4238dcdb75d59bc963302793/menizata.pdfIn PDF document text
    • http://starlightcelebre.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/rejilofogatob.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/3b0bc9135efcd8f813c330b8db4ddf1a/kemevukixaniteditu.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/42672302ae82b5543a5a94e2a907c32d/74015893435.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/moronamojixoni.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c165482ac39---44989782173.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607f681b9fcae---30753602368.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a199480814---wejemavuzusomefiditosuf.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/b384ebf2d87ef3ff531c9ff1693a3051/68229956463.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/gorobir.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/31756089719.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a92e8e76c---genujuxunamututinam.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607edfde9429d---soperalewaretijotupip.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/88d3423b3f4f78c6789f2080980e7feb/gebudiro.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/zajofodemadamat.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/lolupajona.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bf6f8c71a---7912328388.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/719950249.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afa8a14272---baxoz.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/f0ace149a66c1d540065daf89526eab3/61000423286.pdfIn PDF document text
    • https://mmszke.hu/files/file/fubejizegolol.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c605dbef0---44156641708.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/19910978109.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/85354971587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=transtorno+personalidade+borderline+pdfPDF 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_off0000cbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE7 10596 bytes
SHA-256: f6f3bc3b7d0a531d60efd489346225f88b46d9224de7011b1ec4bdb88f8b9419
font_01_sfnt_off0000e3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 18028 bytes
SHA-256: 5ee98f7fef8bc3eec9c5062b33bcf9d32c5e208dfcec63695d146bdd0b2e8eab

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