Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04a8ff75de44616…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 17:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b40e94cac4f09cd00f37f48939b3708b SHA-1: 109eab9b0dfcbb7adfb5073aaf812c15c3057558 SHA-256: e04a8ff75de4461673b72360cafef7539dba6343dbaaf821b482d602aa43da47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs hosted on various domains, many of which are flagged as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially compromised CMS upload storage reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tpijobportal.com/ckeditor/ckfinder/userfiles/files/zunemefaborofekusi.pdf In PDF document text
    • https://a-guskov.ru/uploads/files/vuzazaxofuj.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/borisag.pdfIn PDF document text
    • http://analhospital.net/file/files/69116020198.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/tofixasudodegijana.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/77251593673.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/57184109e5696ac19f3fcd9cb0598ad1/11408156643.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/88337303077.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/zewakomavevozezixaxeb.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/20769277290.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a176a3195---43908759097.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16136209144968---ruzugokoxugome.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/80097469967.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/97503147262.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210902024724792870edemgu.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/dubufo.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/36551824558.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090519043610981.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/17568592948.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/59939168628.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/wudajovufinuseme.pdfIn PDF document text
    • http://web5gstore.com/Files/files/77754433743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=watch+punjab+1984+full+moviePDF 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_off0000da2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 11412 bytes
SHA-256: a6b806df84d8f2a0ce3d1a220106126eacab1fd8dfa80c378545ec2bfde1cb18
font_02_sfnt_off00010cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEC 17596 bytes
SHA-256: 2bc02849925a9c4e78790b22a497bc050114843e0e03bc5eae987191dfffedcc