Malicious PDF — malware analysis report

Static analysis result for SHA-256 d981cf52d73fea23…

MALICIOUS

PDF

85.6 KB Created: 2021-09-09 05:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a2135b68b4067f7fd02187ae435c70e0 SHA-1: b12826f2265154c9c0c3642d78885e3e82b040e0 SHA-256: d981cf52d73fea2307cdae33b68ae09d59eba72ad5411cd359ac7ffe759acd82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with several pointing to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://studiogiovannone.com/userfiles/files/juxapinelojipopubusonaded.pdf In PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/6975212097.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/10090099259.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/jigipuxokufawimidaz.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/9924318005.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/wetamisovorerobapejafaje.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/nokazupazobukirad.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/21736857141.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/62249839243.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/jojevawerogisomi.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p8rvn3kpl72a345srllsr66mu3/sixadosufidavezasaxi.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/gipebedizonivap.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/gikitazuje.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-9/20210909051912368929.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210903014650.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/gilutewosamewana.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2so6c815tkrprum1inanju7gvj/7192058049.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/46549927892.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/86027673907.pdfIn PDF document text
    • http://fohow77.ru/upload/file/pogirobekupo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161340cd183017---roladam.pdfIn PDF document text
    • http://trieuduong.com/images/Download/36528822741.pdfIn PDF document text
    • http://kodemari.info/data/files/66464013214.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/53975293450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=bagan+keyboard+mod+apkPDF 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_off0000dda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA8 22776 bytes
SHA-256: 4f396355d2b9a9aa8321f88a9b716ee10938f4faa1229454b6d5deb6d36002d0
font_01_sfnt_off0001185e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185E 10728 bytes
SHA-256: e295f8b8d667324015d4f67ac9118d64278bf5077baee3f71e99c67e5a51d207
font_02_sfnt_off00013093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1