Malicious PDF — malware analysis report

Static analysis result for SHA-256 2937ad266e6bc82e…

MALICIOUS

PDF

75.8 KB Created: 2021-09-28 01:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d6bf2a474c16e1efef49214585a43e2 SHA-1: 4cbdcacdd330df3c4e0302c034b1ce5f8c416b2d SHA-256: 2937ad266e6bc82eb74fe8aa2077f8e244a4e3c242793622780bc5b3fda4dc28
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, pointing to multiple compromised WordPress upload storage locations and disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ahnil.com/userData/board/file/gobogatogutibijera.pdf In PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/jajuwedufet.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135b8aa9e620---19351048767.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/34094317783.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/lezifosasokidexalo.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/xedozilira.pdfIn PDF document text
    • http://studiodelcorso.eu/userfiles/files/25481934024.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/xedexidotesez.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/10892490123.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/15357725616.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/2192551253.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/31741494546.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161409142f1e77---tefepujepiv.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/57675229099.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/74677809551.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/99748084293.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161523aad5ddfe---2067412373.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/xubanizutoxuzorize.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ldvlek6vdamh64ic4iore0bln5/xetopimisa.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/gimurudezematevejupotediw.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/nujoxovezupux.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161357ea49f7b2---68051426592.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/13275535436.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210910/file/60159558871.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615222150345e---vopadazuxesamopitokol.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/sigazigumakalid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=watch+a+cinderella+christmasPDF 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_off0000bf6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 10508 bytes
SHA-256: 09a9838b8e829881b8f78464766b51deb0c6788ba18b622b2ac4c120b2920406
font_02_sfnt_off0000ef3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 19292 bytes
SHA-256: 6267862d2d33327db31d89b875ccdee2c3e26d9e840e1547a5bfec679915ce2e