Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65797dc13823c5b…

MALICIOUS

PDF

86.0 KB Created: 2021-09-05 04:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 49126886281ffa05b859ea47d0793df8 SHA-1: 65453e966411939256b1527b64efc3de182f16d1 SHA-256: a65797dc13823c5b62d135f72071bfeb63f04384c47c6ba427d0fad489a33576
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://queure.ru/uplcv?utm_term=melhor+conversor+de+pdf+em+mobi PDF link annotation
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac282aec442---ruvuletamoram.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/gexuxujekagufoxa.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/pimajakatopemavejuteler.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/nikikodufidikixukediwowaf.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160888e5d168bc---pefuzozalulemapola.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/dazogunivomodomeguxewaz.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/vudetevo.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/sabadapilo.pdfIn PDF document text
    • https://seerupit.dk/assens/file/xewevojoresumajo.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/55407373660.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d30744715---62818604744.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210614_727512BA8C7F8EF2.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/sumubobogavikejap.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/kuwuzubegusisivib.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/eq3rd3o6e6d57ma7orlhq03k22/70354941270.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/papinowedelotub.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e73cc506c---48298545669.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/46220444881.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ffcd071358---malulozode.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/mobezagelipatugamizop.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c63c611a52d---tuxopakok.pdfIn PDF document text
    • http://iccarrentals.com/files/file/judililawoniwizew.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3a7d97cf3---likebuxanuranabifo.pdfIn PDF document text
    • http://lucann.com/Upload/file/76371018593.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f956f61cf0c---65619517747.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_off0000e5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBC 21040 bytes
SHA-256: 967536f9db776c572fe623fb30362f73bf195aea4e420d41a3a08870877127a0
font_02_sfnt_off00013133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13133 10824 bytes
SHA-256: da0e4a4305e0049babb6c4cf42a583f898d532e6fe90e73888a5fb67c7e07fd6