Malicious PDF — malware analysis report

Static analysis result for SHA-256 738caf3f70426704…

MALICIOUS

PDF

70.6 KB Created: 2021-09-06 06:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab80f9750c5c4c03c8e31e2f67dc92bd SHA-1: f4b178a912a4b8b539f54e390f5543bf422d9822 SHA-256: 738caf3f70426704baeb074aa8dd59a4033ba0b2aa129f9c47f0ecb612071390
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ildungrice.com/fileupload/fckeditor/file/74304487613.pdf In PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093b402cf52c---bopawukabemegeno.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/donibalevotupezukovivo.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/tisajawowugobiwo.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/52992829129.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/vumupipexawizujadubimu.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/tizirimomotivatizumit.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/14846813769.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/24658554002.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/vuxekeb.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609914ba39693---werelulitomepazotexukoxix.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f453534dbc9---55396703730.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/nofcopmjiif0ridt00m79kbvbo/3922779062.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/5dc8t1f8g17s6q9ueblo1p49d1/50557623967.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/78094165639.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/eb07dd21bd4b7904aa66cc0ad4ebe9ab/nowiwovolafasetasud.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/zelututezakavapafok.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/jipukakanu.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/32983366643.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/1531602729eee4565e57b5d07011b8ce/20527275711.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd5d2c95b7---banobozuv.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-29/20210629083415981886.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/vusodimod.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607018cdd8d16---biwitakexijedadegamuw.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083558227df9---32613881402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=2003+nissan+teana+owners+manualPDF 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_off0000b360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB360 15836 bytes
SHA-256: 95cb23bc45dba087fe4c431d66026ac9dfe641025f41296666530e33f58f3f4b
font_01_sfnt_off0000db68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 10772 bytes
SHA-256: b3acee176a9c354863e33c1144be87016e5c5f8a2a6002a0b6194cd41a241cca
font_02_sfnt_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1