Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf571a14e8b8e5a0…

MALICIOUS

PDF

82.1 KB Created: 2021-10-08 09:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 49ea47ea734f4bb14d87cdda63ed2ca4 SHA-1: dda464ce20d205f70c53ca5d3767fed3d48a5483 SHA-256: bf571a14e8b8e5a0a094d911ecf9285f3a93263f067a3714ccc475d1eee420b4
156 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 or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external links and the nature of the hosting suggest an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://oniceh.ru/uplcv?utm_term=pork+ragout+meaning PDF link annotation
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/42292135740.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/wizagajetarederarapatevow.pdfIn PDF document text
    • https://rajaunited.com/contents/files/79812792607.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/79815396269.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/mopivotisumagifavezazata.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/m0vogk34n9ee0vgaeliqkd9ld4/2281989.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/88351516854.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/kezime.pdfIn PDF document text
    • http://3234.us/data/attachment/file/5504430093.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/194979767.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/pamobewajeso.pdfIn PDF document text
    • http://miminku2.com/contents/files/metudofikegono.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/39937455677.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/tewugagepuxewupove.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/0b82538b11bca46cde25031538b5cd9f/nolem.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/xofafunakujasi.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/kuwovakinuwoxoxovonoxe.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/fovogejigi.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/11485866639.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/de8f3babaa9f6cad7b72145829e13fbf/wekebaxumavafatigik.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/7183973845.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/54860543815.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/lekazuzeseladefexaderiv.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_off0000d67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67B 10432 bytes
SHA-256: 773c4b7c78a250bcff31f630198701041407ec59886a9f247d4cbfdd1a9e93d3
font_01_sfnt_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 20252 bytes
SHA-256: 93fc1e9b2990cd27eab40c61038f2ea9b11f5132eb09900e0647a1f07625ec0b
font_02_sfnt_off00012321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1