Malicious PDF — malware analysis report

Static analysis result for SHA-256 65dc5fefaafe2c9a…

MALICIOUS

PDF

79.8 KB Created: 2021-09-11 17:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a51fa67cea2ede6955e09835d9ea7541 SHA-1: d7922898ec49046290c39b47870aa7f6d5d98b87 SHA-256: 65dc5fefaafe2c9a93d070a69192f5ba9e8a14c619b80d21a81682cc214ca0db
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users to potentially malicious websites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple compromised CMS upload links and disposable hosting further supports the malicious nature of the document.

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://coretry.ru/uplcv?utm_term=como+instalar+novo+android PDF link annotation
    • http://telegid.tv/userfiles/file/letigalezanalimupitujosa.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/patugobad.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/butexenubo.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/031515556020.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/xafupifalejome.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/13176118319.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c59b12903c---tivegi.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/jumoforikara.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/jajoxonivu.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/napuzipejinusokepodomaruj.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/81391148058.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/31356680160.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/vusosedekeretebirasisa.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/41382297674.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/90839523551.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/wakulegokenakajaregupa.pdfIn PDF document text
    • http://kccmaul.com/files/files/bezofetijabowi.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/53123524026.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/48013629121.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161397b98acf91---bedupegaliteniviripitif.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613998a949289.pdfIn PDF document text
    • http://zzquansu.cn/d/files/99748961942.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d735d02d---labunarejorowoniwifususif.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_off0000d206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD206 19412 bytes
SHA-256: 2055c685814164a7ff7d9d6c49d1514911402352573d7427a2294af1b9e42707
font_01_sfnt_off00010237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4E 10376 bytes
SHA-256: aadb556a48c6114a3adf0901cc31ab9851d8aac247fde7c888af5e3db22088ce