Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15712aaa1685011…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 05:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7c7becefad681c26765d59bc85f05a7a SHA-1: 22926d24aa68d599d3862e19fc4338ea8b614133 SHA-256: a15712aaa16850113a57bfdacb69d6757755da198f552dffadea1c04d373dbc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://internationalmedia.com/userfiles/file/silezasatowut.pdf In PDF document text
    • http://vhshf.de/File/mokipu.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/wusonamibeba.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/22964392515.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/20216880390.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/jenunelibotamebivog.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa2639bfcb---56123142563.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/1575153314.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/vizesogelexopogag.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613609d5df7c2---34750798161.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137911dae9a8---95093154398.pdfIn PDF document text
    • http://clickvay.com/upload/files/81703003408.pdfIn PDF document text
    • https://austarpharma.com/upload/files/67155171558.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/61447240466.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/61712690155.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/dopizaxi.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/31165566615.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/25071888486.pdfIn PDF document text
    • https://nuteuit.ro/ckfinder/userfiles/files/donifizalogu.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/ladimu.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/vunagazixoxu.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/60054584480.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/9a59f390567e25fa80fbe0c7789b8d9e/buxenekomikatunek.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/55784401398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=popup+window+in+androidPDF 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_off0000b2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E2 10128 bytes
SHA-256: b2c37cdea08d9b8685e2392d947c0f814cf4fe62e961100941e0b4b720c658e1
font_01_sfnt_off0000c997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC997 15560 bytes
SHA-256: 560b045ee95d5049fca7535d1cd9eb9ddfa0140cccf601dc38de262b326d9f05
font_02_sfnt_off0000f0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1