Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f7deeb8f504d88…

MALICIOUS

PDF

76.5 KB Created: 2021-09-02 03:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d371ec65a85dac39576ba2825816a129 SHA-1: 07b11bfbea97ebda2a1749af698382e45ba94c71 SHA-256: f2f7deeb8f504d88e5a8eec43480831a357aaa7f01d3a6c35bbd9c8e8508b40d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to execute malicious actions within a PDF. The presence of multiple link farms pointing to potentially compromised domains and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://advantagelic.com/singhania/downloads/file/45200857052.pdf In PDF document text
    • http://anandamsanyal.com/userfiles/file/16179167230.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/o0fd6riaa4ua9ftgh39fcdnpd0/notafolotorun.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/3112227385.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/bazobesijevejozegubalel.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/e489494387a4c146031041a6c53221b9/90641882992.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/gebunowerivuwuzevafor.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/77623688540.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/kipiwele.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608237109fe92---rofed.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/naxon.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021052910431673499.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2537b2c05---folukotodofovunorara.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083da3918b45---83193229513.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/nuxitunogiladeduti.pdfIn PDF document text
    • https://dalba.net/other_files/File/xurazapoxasimotar.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/26536782215.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f8d73811a---jufebotitimolugewojazebe.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/fafutowufubefopepe.pdfIn PDF document text
    • http://codefon.hu/js/ckfinder/userfiles/files/18541498239.pdfIn PDF document text
    • http://cy2hand.com/userfiles/46905339314.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/pofat.pdfIn PDF document text
    • http://teifsepahan.com/files/file/siwakaluwelokotinebaz.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b04ce0dbb---28676855815.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/xolavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=heartburn+is+caused+byPDF 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_off0000c900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC900 10540 bytes
SHA-256: 3b13ea129fa5a12d0cf651fd88e4a9d9f1c5c6a93a01168467620771dbdffafd
font_01_sfnt_off0000e11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11F 16460 bytes
SHA-256: ee64fabd72f006df15f53ba41ed20d26fc33dcff544aed347804a73593b49f8f
font_02_sfnt_off00010b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1